7th International Conference on Attosecond Science and Technology

University of Szeged Congress Centre

University of Szeged Congress Centre

Ady Square 10., 6722 Szeged, Hungary

The International Committee of the Attosecond Science and Technology Conference is pleased to announce that the 7th International Conference (ATTO2019) will take place in Szeged, Hungary from July 1 to 5 2019.

ATTO2019 will cover all aspects of attosecond science and technologies from sources and metrology to applications. The main research topics to be discussed include:

• (1) Attosecond pulse generation and characterization

• (2) High-order harmonic generation and applications

• (3) Ultrafast phenomena on the attosecond and femtosecond timescales

• (4) Next generation drivers for attosecond pulse and high-order harmonic generation

• (5) New sources and applications of coherent ultrashort XUV and X-ray pulses

• (6) Time-resolved photon, electron and ion spectroscopy.

Further information on the conference will be regularly posted on the website www.eli-alps.hu/atto2019 and the local organizers can be contacted at atto2019@eli-alps.hu. The organisers warmly invite you and your colleagues to join us for this conference.

Book of Abstracts
4. Registration for Sponsor Representatives
5. Registration for Sponsors
    • 08:30 10:15
      Strong field physics in topological and chiral materials: #2
      • 08:30
        Photoionization Of Chiral Molecules By Bicircular Bichromatic Fields: A Chiral Attoclock 30m

        We present experimental and theoretical investigations on photoionization of chiral molecules by counter-rotating bicircular bichromatic lasers. Forward/backward asymmetries in the photoelectron momentum distributions reveal the influence of chirality on sub-cycle interferences and angular streaking.

        Speaker: Dr Yann Mairesse (University of Bordeaux)
      • 09:00
        Strong-Field Laser Physics in Topological Condensed Matter 30m

        I will illustrate the electron dynamics in 2D, laser-driven topological matter with the help of simple model systems.

        Speaker: Prof. Dieter Bauer (University of Rostock)
      • 09:30
        Background-Free Electric Dipole based Chiral-HHG by Symmetry Breaking Spectroscopy: Theory and Experiment 15m

        We propose and demonstrate experimentally an ultrafast chirality spectroscopy technique based on non-collinear harmonic generation, which relies only on electric-dipole interactions. The scheme is based on symmetry breaking, i.e. the chiral signal resides in harmonics that are forbidden when the medium is achiral/racemic, leading to a background-free signal. Moreover, by controlling the pump’s symmetry properties the technique also yields a huge enantio-sensitive response – we experimentally measure 163% R/S selectivity.

        Speaker: Mr Ofer Neufeld (Technion)
      • 09:45
        Locally and Globally Chiral Fields for Ultimate Control of Chiral Light Matter Interaction 15m

        We introduce locally and globally chiral fields and demonstrate the highest possible degree of control over nonlinear chiroptical response, fully suppressing high harmonic emission in a desired enantiomer while enhancing it in its mirror twin.

        Speaker: Dr David Ayuso (Max Born Institute)
      • 10:00
        Controlling Sub-cycle Instantaneous Optical Chirality in the Photoionization of Chiral Molecules 15m

        Our study shows a sub cycle chiral response between a light pulse with zero total chirality, and a chiral molecule. We engineer an electric field whose instantaneous chirality changes sign every half cycle, and observe an instantaneous chiral response. The response can be controlled by changing the temporal behavior of the pulse, on a sub cycle resolution. We show qualitative agreement between experiment and theory.

        Speaker: Ms Shaked Rozen (Weizmann Institute of Science)
    • 10:15 10:45
      Coffee 30m
    • 10:45 12:30
      Laser-induced dynamical processes in molecules: #11
      • 10:45
        Attosecond Electron-Nuclear Dynamics in Photoionized Molecules 30m

        Ultrafast electron-nuclear dynamics can nowadays be accessed using attosecond XUV/IR pump-probe protocols. Recent accurate theoretical simulations describing the sub-femtosecond dynamics triggered in ionized diatomic and polyatomic molecules are presented.

        Speaker: Dr Alicia Palacios (Universidad Autónoma de Madrid)
      • 11:15
        Ultrafast Imaging of Laser-controlled Non-adiabatic Dynamics in NO$_2$ from Time-resolved Photoelectron Emission 15m

        We show that time-/energy-resolved anisotropy parameters of photoelectron angular distributions provide a clear mapping of both the ultrafast natural dynamics at the conical intersection of NO$_2$ and its modifications induced by an ultrashort control pulse.

        Speaker: Dr Maria Richter (Max-Born-Institute)
      • 11:30
        Generalized Phase Sensitivity of Molecular Bond Breaking 15m

        We investigated the relation between the intrinsic and CEP-induced asymmetries in laser-induced bond-breaking of H$_{2}$. We show that the intrinsic asymmetry is modulated by the CEP via the variation of the field-strength at the ionization-time.

        Speaker: Mrs Sarayoo Sasidharan Kangaparambil (TU Wien)
      • 11:45
        Bondsoftening Revisited 15m

        We reveal an unexpected facet of bond softening in H$_2$, namely a strikingly structured angular distribution of emitted protons. The angular modulations arise from rich dynamics in a light-induced potential landscape, which we track experimentally.

        Speaker: Matthias Kübel (Friedrich Schiller University Jena)
      • 12:00
        Laser-Induced Dissociative Recombination of Carbon Dioxide 15m

        Using multi-body coincidence measurements, we studied laser-induced dissociative recombination of CO$_{2}$ after strong field double ionization. We observed the localization of the recombined Rydberg electron dominantly on O$^{+}$ rather than CO$^{+}$.

        Speaker: Dr Hongtao Hu (Technische Universität Wien)
      • 12:15
        Ultrafast Laser-assisted Stabilization of Ionized Adenine 15m

        A NIR pulse following attosecond XUV-photoionization at specific time delay can prevent irreparable damage of adenine. We identify the stabilizing mechanism in electronic correlation driven charge migration away from the molecular plane.

        Speaker: Dr Simone Latini (Max Planck Institute for the Structure and Dynamics of Matter)
    • 12:30 14:00
      Lunch 1h 30m
    • 14:00 15:45
      Ultrafast quantum dynamics in laser fields: #10
      • 14:00
        Strong Field Physics in Topological Systems 30m

        We use unique properties of primary electronic response to non-resonant optical fields to reveal topological effects in strong field dynamics of quantum matter, including topologically induced time delays in strong-field optical response.

        Speaker: Álvaro Jiménez-Galán (Max Born Institute)
      • 14:30
        Attoclock Experiments Using Atomic and Molecular Hydrogen 15m

        We present the results of the first attoclock experiment using atomic hydrogen wherein the tunnelling delays under strong-field ionisation were probed with a reaction microscope and 770 nm circularly polarised ($\epsilon=0.84$) few cycle laser pulses in the intensity range of 1.65 to $3.9 \times 10^{14}$ W/cm$^2$.

        Speaker: Dr Satya Sainadh Undurti (Technion)
      • 14:45
        The Strong-Field Response of an Ionization Threshold 15m

        We observed light-induced structures near the ionization threshold in the attosecond transient absorption spectrum in helium. By comparing to multi-level model simulations, we isolate the response of the onset of a continuum.

        Speaker: Mr Paul Birk (Max Planck Institute for Nuclear Physics)
      • 15:00
        Molecular Orbital Imprint in Laser-driven Electron Recollision 15m

        One of the commonly used assumptions underlying the analysis of attosecond strong-field spectroscopies is that in the propagation step any information on the initial state of the ionized electron is lost. For example, it is commonly assumed that any information on the orbital from which the electron originates is "washed out" during the propagation step, and no longer influences the recollision process. Here we have tested this central assumption experimentally and theoretically by studying molecular-frame elastic laser-induced electron rescattering associated with two different ionization continua in the same polyatomic molecule.

        Speaker: Dr Jochen Mikosch (Max Born Institute)
      • 15:15
        Phase Analysis of Multidimensional Inline Extreme Ultraviolet Interferometer 15m

        We demonstrate an inline extreme ultraviolet interferometer based on high harmonic generation and reveal phase sensitive measurements of electronic quantum trajectory perturbations when driven by a variable elliptically polarised field.

        Speaker: Adam Wyatt (Central Laser Facility)
      • 15:30
        Amplification of Intense Light Fields by Nearly Free Electrons 15m

        We present new opportunities for enhancing and controlling lasing inside laser filaments. The novel, general mechanism relies on laser-dressed states in neutral atoms and uses shaped laser pulses to control their population and seed gain.

        Speaker: Dr Maria Richter (Max-Born-Institut)
    • 15:45 16:15
      Coffee 30m
    • 16:15 18:15
      Isolated attosecond pulse generation and control: #7
      • 16:15
        Capturing the Fastest Dynamics in Materials using High Harmonic Sources 30m

        In recent work, we captured intrinsic sub-femtosecond electron-electron scattering dynamics in materials for the first time. A powerful new technique called atto-ARPES (i.e. attosecond angle-resolved photoemission) enables deep-sub-fs measurements with sufficient energy resolution to separate different bands and states. This is the first way to directly probe the contribution of electron scattering and screening to low-energy excitations near the Fermi level.

        Speaker: Dr Margaret Murnane (University of Colorado Boulder)
      • 16:45
        Attochirp Compensation and Characterization beyond C K-edge 30m

        It is demonstrated by numerical simulations that attosecond chirp in the 300 to 1000 eV range can be partially compensated by the negative dispersion of ionized or unionized molecular hydrogen gas to achieve 25-as duration.

        Speaker: Prof. Zenghu Chang (University of Central Florida)
      • 17:15
        Generation and Characterization of Isolated Attosecond Pulses for Coincidence Spectroscopy at 100 kHz Repetition Rate 15m

        Here we present an attosecond pump-probe beamline driven by a high power non-collinear optical parametric chirped pulse amplification (NOPCPA) system capable of running at a repetition rate of 100 kHz with a maximum output power of 24 W.

        Speaker: Dr Tobias Witting (Max-Born-Institut)
      • 17:30
        Isolated, Tunable Soft X-ray Attosecond Pulses at μJ Pulse Energy from a Free-electron Laser 15m

        We report the generation of isolated soft X-ray attosecond pulses with pulse energies of tens of microjoules using an X-ray free-electron laser.

        Speaker: Dr Taran Driver (Stanford PULSE Institute, SLAC National Accelerator Laboratory)
      • 17:45
        Propagation-enhanced Generation of 100-eV Intense High-harmonic Continuum 15m

        We present a robust generation of intense isolated attosecond pulses in the 100-eV spectral range for time-resolved nonlinear XUV spectroscopy. Through single-shot acquisitions and three-dimensional simulations we provide a complete description of the underlying processes.

        Speaker: Daniel Rivas (European XFEL)
      • 18:00
        Extreme-ultraviolet Refractive Optics 15m

        Here we demonstrate control over the refraction of XUV radiation by using a gas jet with a density gradient across the XUV beam profile. In a first set of experiments, a gas-phase prism and a gas-phase lens are demonstrated.

        Speaker: Oleg Kornilov (Max-Born-Institut)
    • 18:15 20:15
      Poster session 1: Monday poster session with sandwiches

      Monday poster session

      • 18:15
        1.4 mJ Supercontinuum Generation in Solid Thin Plates 2h

        A supercontinuum covering 480 to 930 nm was generated in seven thin fused silica plates with energy of 1.4 mJ at 1 kHz repetition rate, and the efficiency was close to 80%, supporting a sub-10-fs pulse duration.

        Speaker: Mr Siyuan Xu (Xidian University)
      • 18:15
        A Beamline combining XUV Attosecond Pulses with sub-2 fs Deep-UV Pulses 2h

        1.9-fs deep ultraviolet pulses (150 nJ) are obtained from third-harmonic generation in argon using a laser micromachined gas cell. The source is synchronized with isolated attosecond XUV pulses offering new avenues in attosecond spectroscopy of bio-relevant molecules.

        Speaker: Vincent Wanie (Center for Free-Electron Laser Science, DESY)
      • 18:15
        A Direct Approach to Probe Tunneling Time 2h

        An approach is presented to directly probe the tunneling time, where the influence of Coulomb potential is avoided. A positive tunneling time is extracted, which is almost not influenced by the laser intensity in some range.

        Speaker: Dr MingHu Yuan (Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences)
      • 18:15
        A Quantum Concept of Attosecond Radiation 2h

        It has been shown that symmetric entangled coherent states of a many-mode optical radiation always result in completely locked Fourier superpositions for the expectation value of the electric field operator. Accordingly, in case of such entangled states, even an occasionally random distribution of the phases of the complex amplitudes cannot spoil the locking of the temporal Fourier components. This is in contrast to the case of simple product multimode coherent states, where the possible randomness of the mutual phases should result in a random temporal evolution of the radiation field. When our present formal result on the symmetric entangled states is applied for a sequence of high harmonics, the appearance of attosecond pulse trains can immediately be derived in the frame of the quantum optical description of the radiation field, in accord with various experiments. However, the question still remains whether truly these entangled states are generated in the high-harmonic production processes.

        Speaker: Prof. Sandor Varro (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:15
        Above Threshold Ionization Features Driven by Few Cycles Bounded Inhomogeneous Electric Field 2h

        This works describes in detail the main photoelectron spectra features after excitation with several driven wavelengths under inhomegenous field conditions. Quantum and classical simulations are in good agreement showing an important cut-off enlargement and high photoelectrons yield.

        Speaker: Mr Pedro Rueda (Centro de Investigaciones Ópticas-CONICET-CIC-UNLP)
      • 18:15
        Alpha Decay in Intense Laser Fields 2h

        We calculate the effect of intense laser fields on nuclear alpha decay process, using realistic and quantitative nuclear potentials. We show that alpha decay rates can indeed be modified by strong laser fields to some finite extent. We also predict that alpha decays with lower decay energies are relatively easier to be modified than those with higher decay energies, due to longer tunneling paths for the laser field to act on. Furthermore, we predict that modifications to angle-resolved penetrability are easier to achieve than modifications to angle-integrated penetrability.

        Speaker: Prof. Xu Wang (Graduate School, China Academy of Engineering Physics)
      • 18:15
        Anisotropic High-harmonic Generation of MgO 2h

        We investigate the anisotropic high-harmonic generation with laser fields from linear to circular polarization. To reveal the underlying microscopic dynamic, a real-space trajectory method with atom resolution is proposed.

        Speaker: Mr Liang Li (Huazhong University of Science and Technology)
      • 18:15
        Atomic and Molecular Suite of R-matrix Codes for Ultrafast Dynamics in Strong Laser Fields and Electron/Positron Scattering 2h

        We describe and illustrate a number of recent developments of the atomic and molecular ab initio R-matrix suites for both time-dependent calculations of ultrafast laser-induced dynamics and time-independent calculations of photoionization and electron scattering.

        Speaker: Dr Zdenek Masin (Charles University)
      • 18:15
        Attosecond Correlation with Actively Stabilized Extreme Ultraviolet Interferometer 2h

        We developed an actively stabilized extreme ultraviolet (XUV) interferometer (stability: 7.8-as RMS over 12 hours) and thereby demonstrated the interferometric 1st-order autocorrelation of an isolated attosecond pulse with 100-as periodicity in the XUV region.

        Speaker: Hiroki Mashiko (NTT Basic Research Laboratories)
      • 18:15
        Attosecond Electron Localization in Metallic titanium 2h

        We investigate attosecond electron dynamics in metals with transient absorption spectroscopy supported by ab-initio calculations. We find that optical excitation of metallic titanium leads to an ultrafast electron localization and modifies electronic screening.

        Speaker: Mikhail Volkov (LMU Munich)
      • 18:15
        Attosecond Metrology Using Two-photon Resonant Raman-type Transitions 2h

        We suggest a new method of the attosecond pulse characterization using two-photon resonant Raman-type transitions via continuum. Similar technique can be used for measurement of the Wigner time delay for the Raman transitions.

        Speaker: Valeryia Birulia (Moscow Institute of Physics and Technology)
      • 18:15
        Attosecond Photocarrier Excitation in III-V Semiconductors 2h

        Using transient absorption spectroscopy, we investigate laser-induced attosecond electron dynamics in III-V semiconductors. We find a complex interplay between intra- and inter-band transitions in the transient response. Our findings are supported by ab-initio calculations.

        Speaker: Mr Fabian Schlaepfer (ETH Zurich)
      • 18:15
        Attosecond Photoelectron Holography in Strong Field Tunneling Ionization 2h

        Tunneling ionization of atoms or molecules by a strong laser field generates an electron wavepacket. This electron wavepacket could reach the detector directly or undergoes rescattering by the parent ion, giving rising to the interference in the photoelectron momentum distribution (PEMD), referred as photoelectron holography in strong field tunneling ionization. We will first show how the structure information was encoded in the hologram and proposed a procedure to extract the important structure information, the phase of the elastic scattering amplitude. Then, we will reveal how the information of valence electron motion is encoded in the hologram of the PEMD.

        Speaker: Dr Yueming Zhou (Huazhong University of Science and Technology)
      • 18:15
        Attosecond Pulse Train Generated with Short Pulses Compressed by Thin Plates 2h

        We used fused silica thin plates to broaden the spectrum of femtosecond pulses. After careful group delay compensation, the 10 fs, 800 nm pulse was focused on Ar, and a train of 308 as pulses was detected.

        Speaker: Ms Yujiao Jiang (Xidian University)
      • 18:15
        Attosecond Time Delay in Photoionization of Noble-Gas and Halogen Atoms 2h

        We calculate photoionization cross section, asymmetry parameter and Wigner time delay for noble-gas and halogen atoms. We find that halogen atoms bear a strong resemblance to their noble-gas neighbors.

        Speaker: Dr Liangwen Pi (Max-Planck-Institut für Physik Komplexer Systeme)
      • 18:15
        Attosecond Time Delays in Photoionisation of Noble Gas Atoms and Small Symmetric Molecules 2h

        Trains of attosecond pulses are suitable tools to unveil the ultrafast dynamics of electrons. Here we report the results of photoionization time delays in atoms and small molecules resolved over angle and energy of emission.

        Speaker: Mr Matteo Moioli (University of Freiburg)
      • 18:15
        Autoionizing Rydberg States of H$_2$ Molecules in Strong Laser Field 2h

        Channel resolved electron emission from strong-field photoionization of H$_{2}$ molecules were measured using ultrashort laser pulses and a reaction microscope. An enhancement of the photoelectron yield in the low-energy region was observed for the case of bound ionization. This enhancement is understood as the population of autoionizing Rydberg states in the neutral molecule and subsequent transfer of energy from the vibrational motion to the electron.

        Speaker: Dr Yonghao Mi (National Research Council of Canada)
      • 18:15
        Broadband Terahertz Generation in Organic Crystals by Optical Rectification of Intense Mid-Infrared Pulses 2h

        We demonstrate broadband THz generation in organic crystals driven by mid-IR $3.9\,\mathrm{\mu m}$ pulses. Due to the suppression of multi-photon absorption, we record an order of magnitude increase in the damage and optical to THz conversion saturation thresholds as compared to conventional near-IR pump schemes.

        Speaker: Claudia Gollner (TU Wien)
      • 18:15
        Carrier-envelope-phase Stabilized KLM Yb:CYA Laser with Feed-forward Scheme 2h

        We report a carrier-envelope phase stabilized kerr-lens mode locking (KLM) Yb:CYA laser with feed-forward methods. Signal-to-noise (SNR) of the out-of-loop carrier-envelope-offset (CEO) was measured to be 38 dB. Timing jitter of the stabilized CEO was 44 as.

        Speaker: Ziyue Zhang (Institute of Physics, Chinese Academy of Sciences)
      • 18:15
        CEP-controlled Non-adiabatic Transitions Visualized by Photoelectron Spectroscopy and Attosecond Transient Absorption Spectroscopy in LiH 2h

        We steer the LiH molecule towards a target dissociation channel by using few cycle CEP stabilized IR pulses and follow the dynamics using both time-resolved photoelectron spectroscopy and attosecond transient absorption spectroscopy.

        Speaker: Stephan van den Wildenberg (University of Liege)
      • 18:15
        Characterisation and Modelling of Ultrashort Laser-Driven Electromagnetic Pulses 2h

        We will demonstrate based on experimental results a direct correlation between measured EMP energy and the laser parameters such as laser energy and intensity. Finally numerical Finite Element Method simulations are performed of the laser target holder system showing good agreement with the experimental obtained results.

        Speaker: Kwinten Nelissen (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:15
        Charge Migration In Propiolic Acid And Its Dephasing By The Coupling To The Nuclear Motion 2h

        Using ab initio methods we identified a molecule in which charge migration dynamics survive long enough the dephasing by the nuclear motion to be observed and controlled. This represents an important step in the direction of accomplishing the dream of attochemistry.

        Speaker: Dr Victor Despré (Universität Heidelberg)
      • 18:15
        Charges Displaced by Short Laser Pulses in Solids 2h

        Charges displaced by a laser pulse in solids can be useful for detection purposes. Our analytical approach reduces the computational costs, and give us an e?cient tool to investigate this phenomenon.

        Speaker: István Magashegyi (University of Szeged)
      • 18:15
        Coherence of Hole States in Attosecond Photoionization 2h

        We study coherent hole dynamics triggered by attosecond laser pulse within the time-dependent multiconfiguration self-consistent field method. To evaluate coherence from the total wavefunction, we propose a new position-based reduced ionic density matrix.

        Speaker: Mr Takuma Teramura (The University of Tokyo)
      • 18:15
        Coherence Property Comparison of Spectral Broadening Methods in CEP Stabilization 2h

        We measured and stabilized the carrier-envelope phase by f-2f spectral interferometry with supercontinuum generated by sapphire bulk plate, hollow-core fiber and fused silica thin plates and calculated the coherence properties for each method theoretically.

        Speaker: Mr Yitan Gao (Institute of Physics, Chinese Academy of Sciences)
      • 18:15
        Coherence Transfer from Ultrastable Optical Frequency Comb to CW Laser with Feed-forward Method 2h

        We report a precision feed-forward locking between a 1064 nm continuous wave (CW) and an ultrastable optical frequency comb. The relative linewidth of the 1064 nm CW laser is narrowed to 1.14 mHz and the stability reaches 1.5×10$^{-17}$ at 1 s at the optical wavelength of 1064 nm.

        Speaker: Xiaodong Shao (Institute of Physics, Chinese Academy of Sciences)
      • 18:15
        Coherent Multichannel Dynamics of Aligned Molecules Resolved by Two Dimensional High-harmonic and Terahertz Spectroscopy 2h

        We combine the simultaneous measurement of terahertz wave and high harmonic emission to resolve the coherent multichannel electron dynamics of aligned CO$_{2}$ molecules driven by two-color laser field. It provides a new tool for detecting and resolving these multi-electron phenomena.

        Speaker: Dr Xiaowei Wang (National University of Defense Technology)
      • 18:15
        Combining Attosecond XUV Pulses with Recoil-ion Momentum Spectroscopy 2h

        We successfully combined an attosecond XUV pulse and a recoil-ion momentum spectroscopy into our home-built setup. The setup can complete the XUV-infrared pump-probe experiments, which provides attosecond pulse train and isolated attosecond pulse through high-order harmonic generation technology.

        Speaker: Prof. Jianmin Yuan (National University of Defense Technology)
      • 18:15
        Conservation of Torus-Knot Angular Momentum in High-Harmonic Generation Driven by Fields with Spin-Orbit Mixing 2h

        We show that high-harmonic generation conserves a nontrivial mixture of orbital and spin angular momentum, in which both the driving fields and the harmonic emission have novel field topologies and symmetries.

        Speaker: Emilio Pisanty (ICFO)
      • 18:15
        Control of Harmonic Generation by the Time Delay Between Two-Color, Bicircular Few-Cycle Mid-IR Laser Pulses 2h

        The control of high harmonic generation driven by time-delayed, few-cycle ω and 2ω counterrotating mid-IR pulses is analyzed. We show that the time delay between two pulses allows control yield and polarization properties of harmonics.

        Speaker: Mikhail Frolov (Voronezh State University)
      • 18:15
        Decoding Molecular Rotational Dynamics from High-harmonic Generation 2h

        By exploiting machine learning in high-harmonic spectroscopy, we have reconstructed the molecular rotational dynamics with femtosecond resolution from the angular distributions of high-harmonics measured at various time delays of the probe pulse.

        Speaker: Dr Yanqing He (Huazhong University of Science and Technology)
      • 18:15
        Determination of the Ionization Time Using Attosecond Photoelectron Interferometry 2h

        We propose a novel attosecond photoelectron interferometer, which is based on the interference of the direct and near-forward rescattering electron wave packets, to determine the time information characterizing the tunneling process.

        Speaker: Dr Jia Tan (Huazhong University of Science and Technology)
      • 18:15
        Direct Numerical Observation of Real-Space Recollision in High-Harmonic Generation from Solids 2h

        Real-space picture of electron recollision with the parent ion guides our understanding of the highly nonlinear response of atoms and molecules to intense low-frequency laser fields. It is also among several leading contestants for the dominant mechanism of high harmonic generation (HHG) in solids, where it is typically viewed in the momentum space, as the recombination of the conduction band electron with the valence band hole, competing with another HHG mechanism, the strong-field driven Bloch oscillations. In this work, we use numerical simulations to directly test and confirm the real-space recollision picture as the key mechanism of HHG in solids. Our tests take advantage of the well-known characteristic features in the molecular harmonic spectra, associated with the real-space structure of the molecular ion. We show the emergence of analogous spectral features when similar real-space structures are present in the periodic potential of the solid-state lattice as shown in the figure. This work demonstrates the capability of HHG imaging of spatial structures of a unit cell in solids.

        Speaker: Prof. Gopal Dixit (Indian Institute of Technology Bombay)
      • 18:15
        Double Ionization of Neon by Late Recollision Trajectories in Mid IR Wavelengths and the Role of the Magnetic Field 2h

        Double ionization of Neon in mid IR wavelengths is investigated. A new set of late rescattering trajectories connected to a specific regions of the transversal momentum space are described and the effect of the magnetic field discussed.

        Speaker: Prof. Camilo Ruiz (Universidad de Salamanca)
      • 18:15
        Effect of Magnetic Field on Attosecond Photoelectron Spectroscopy by Time-of-flight Spectrometer with Magnetic Bottle 2h

        We construct the attosecond streak camera which adopts magnetic bottle time-of-flight spectrometer, and the flight tube of different lengths and diameters will be used to study photoelectron collection efficiency, noise and spectral resolution.

        Speaker: Dr Xianglin Wang (Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences)
      • 18:15
        Electron wavepacket retrieval with Absolute Complex Dipole transition matrix element reConstruction (ACDC) algorithm 2h

        We developed a new unprecedented accurate algorithm to reconstruct photoelectron wavepackets. It significantly improves prior methods to resolve attosecond time delays in photoemission. Preliminary analysis of experimental data shows excellent agreement with prior results.

        Speaker: Mr Luca Pedrelli (ETH Zürich)
      • 18:15
        Electrons with Equal Energy Emitting Back-to-back in Single Photon Double Ionization of Helium 2h

        Single photon double ionization of helium at photon energies of 440 eV and 800 eV is numerically simulated beyond the dipole approximation. Distributions of ion momentum is in accordance with the experimental results. We also calculated the angular correlation spectrum in the coplanar geometer with equal energy sharing, in which interference between dipole and nondipole paths is included.

        Speaker: Mr Sige Chen (Peking University)
      • 18:15
        Enhancement of High-order Harmonic Generation with a Spatially and Transversely Inhomogeneous Field 2h

        We designed a novel method to increase the high-order harmonic yield by introducing a spatial and transverse inhomogeneity into a mid-infrared laser field, which can be achieved by the illumination of plasmonic nanostructures with a short laser pulse.

        Speaker: Dr Meiyan Qin (Wuhan Institute of Technology)
      • 18:15
        First-principles Time- and Angle-resolved Photoelectron Spectroscopy 2h

        In this study, we will control the photoelectrons by introducing the excited Dirac cones, and show their flip-effects induced by IR (Infrared)-pump.

        Speaker: Mr Youngjae Kim (Department of Emerging Materials Science, DGIST)
      • 18:15
        Generation of High Harmonics in Solids 2h

        Based on results of an ab-initio multi-scale simulation we present the build-up of high harmonics induced by strong and short laser pulses along the propagation direction inside a dielectric. We relate our findings to processes that need to be accounted for in realistic simulations.

        Speaker: Isabella Floss (Vienna University of Technology)
      • 18:15
        Harmonic Generation in Solids Using a Near IR Driving Field 2h

        In the present study, second harmonic generation (SHG) in thin ZnO crystal, pure MgO and Chromium (Cr) doped MgO crystals is investigated. We explore SHG dependence on the orientation angle between the crystal and laser polarization.

        Speaker: Mr Mukhtar Hussain (Universidade de Lisboa)
      • 18:15
        High Energy, Few-cycle Mid-infrared Laser Source Based on Coherent Beam Combining Using Hollow-core Fiber 2h

        We present a high energy, mid-infrared laser source based on coherent beam combining using hollow core fiber. Through coupling two 4 μm lasers generated by optical parametric chirped pulse amplification (OPCPA) into the hollow-core fiber (HCF), we obtained a laser with 2.25 mJ and 22.9 fs.

        Speaker: Dr Qian Junyu (Shanghai Institute of Optics and Fine Mechanics, University of Chinese Academy of Science)
      • 18:15
        High Harmonic Generation in Gaseous Medium by Double-Pulse Forms 2h

        Applying the double-pulse form to generate gas high-order harmonics, the appeared harmonics are narrower and more intense compared to the harmonics that generated by a regular Gaussian-shaped pulse. In this way, a practical method to generate intense, monochromatic pulses in the XUV region is proposed.

        Speaker: Lénárd Gulyás Oldal (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:15
        High Repetition Rate CEP-stable Yb-doped Amplifier for Attoscience 2h

        We report on a CEP-stable YDFA delivering 30 µJ, 100 kHz, 100 fs pulses at 1030 nm. The integrated CEP noise in the bandwidth [1 Hz; 50 kHz] is 325 mrad.

        Speaker: Mr Michele Natile (Amplitude Laser Group)
      • 18:15
        High Repetition-rate, Two-cycle Driver for High-flux HHG 2h

        We demonstrate a hybrid dual-stage nonlinear compression scheme allowing to compress 330 fs-pulses generated from a high-energy ytterbium-doped fiber amplifier down to 6.8 fs pulse duration, with an overall transmission of 61%. This high transmission is obtained by using a first compression stage based on a gas-filled multipass cell, and a second stage based on a large-core gas-filled capillary. The source output is fully characterized in terms of spectral, temporal, spatial, and short- and long-term stability properties. The system’s compactness, stability, and high average power makes it ideally suited to drive high photon flux XUV sources through high harmonic generation.

        Speakers: Michele Natile (Amplitude Laser, Business Unit Science), Florent Guichard (Amplitude Laser, Business Unit Science), Yoann Zaouter (Amplitude Laser, Business Unit Science), Marc Hanna (Laboratoire Charles Fabry, Institut d'Optique Graduate School, CNRS, Université Paris-Saclay)
      • 18:15
        High-energy, Tunable Midinfrared to THz Laser Generated by Dual-chirped Difference Frequency Generation 2h

        We generate a tunable mid-infrared (3 μm) to THz (15 THz) laser using a dual-chirped difference frequency generation (DC-DFG) scheme, which is energy scalable to generate mJ-class THz pulses.

        Speaker: Dr Yuxi Fu (RIKEN)
      • 18:15
        High-Harmonic Imaging of Spin-Polarised Defects in Solids 2h

        Here we employ time-dependent density-functional theory to investigate how the electron dynamics resulting in high-harmonic emission in monolayer hexagonal boron nitride is affected by the presence of point defects.

        Speaker: Mr Mrudul Muraleedharan Shylaja (Indian Institute of Technology Bombay)
      • 18:15
        Holographic Schwinger Effect of Dynamic Fields 2h

        At strong coupling, the scalar Schwinger effect is studied by the field-theoretic method of worldline instantons for dynamic fields of single-pulse and sinusoidal types.

        Speaker: Dr Chen Lan (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:15
        Improved Low Dimensional Modeling of Hydrogen and Helium Driven by a Strong Laser Pulse 2h

        We present our one dimensional models and simulation results of the hydrogen molecular ion and the helium atom that give strong field ionization dynamics quantitatively comparable to the true 3D case.

        Speaker: Szilárd Majorosi (University of Szeged)
      • 18:15
        Ionization Dynamics Through Fano Resonances: Time-domain Interpretations of Spectral Amplitudes 2h

        We investigate the possibilities to fully characterize the temporal profiles of photoemission processes, beyond the mere concept of delay, out of the associated complex spectral amplitudes.

        Speaker: Jérémie Caillat (LCPMR, Sorbonne Université)
      • 18:15
        Isolated Attosecond Pulses via Coherent Thomson-backscattering 2h

        Our theoretical and numerical results suggest that Thomson-backscattering of a NIR laser pulse on a suitable relativistic electron nanobunch creates an isolated XUV – soft X-ray pulse of ca. 20 asec length and uJ energy.

        Speaker: Szabolcs Hack (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:15
        Isolated Terawatt Attosecond X-ray Free Electron Laser 2h

        Micro-bunching instability (MBI) is considered as a critical obstacle for the realization of the isolated terawatt attosecond XFEL. To make high a peak current, the distribution of the electron beam in the phase space should be uniform. The micro-bunching instability will twist the distribution which results in very low peak current value. The effect by MBI has been investigated and a proposal is provided to overcome the obstacle. This will pave a way to the realization of a terwatt level, isolated attosecond pulse at X-ray region.

        Speaker: Yong Woon Park (Pohang Accelerator Laboratory)
      • 18:15
        Isolated Waveform-Controlled Attosecond Pulse Generation by Undulator Radiation 2h

        A linear accelerator based waveform-controlled single-cycle attosecond source is investigated numerically. Pulses with 170 nJ energy and 80 attosecond duration are predicted at 20 nm wavelength.

        Speaker: Zoltán Tibai (University of Pécs)
      • 18:15
        Laser Induced Distortion of Band Structure in Solids: an Analytic Model in Three Dimensions 2h

        We consider a spatially periodic (cosine) potential as a model for a crystalline solid that interacts with a harmonically oscillating external electric field. This problem is periodic both in space and time and can be solved analytically using the Kramers-Henneberger co-moving frame. By analyzing the stability of the closely related Mathieu-type differential equation, the electronic band structure can be obtained. In our former study (for one spatial dimension) we successfully demonstrated that by changing the field intensity, the width of the zero-field band gaps can be drastically modified, including the special case when the external field caused the band gaps to disappear.

        Speaker: Dr Imre Ferenc Barna (ELI-ALPS, ELI-HU Non-profit Ltd.)
      • 18:15
        Longitudinal Momentum of the Electron at the Tunnelling Exit 2h

        The longitudinal tunnelling-exit momentum of the electron in strong-field tunnelling ionization is shown to be nonzero even in the static or the adiabatic limit. This nonzero momentum is a purely quantum mechanical effect determined by the shape of the wave function in the vicinity of the tunnelling-exit point. Nonadiabaticity or finite wavelength may increase this momentum substantially, and the detailed value depends on both the atomic and the laser parameters.

        Speaker: Prof. Xu Wang (Graduate School, China Academy of Engineering Physics)
      • 18:15
        Michelson Interferometry of High-order Harmonic Generation in Solids 2h

        High-order harmonic generation in solids has attracted intensive investigations and many different features have been identified and interpreted. In this Letter, we find a distinct and clean interference pattern in the high-energy end of the spectrum by varying the maximum value of the vector potential of a driving pulse. This pattern can only be observed when the quasi-electron of the solid can be driven to the boundary of the Brillouin zone. Our results are based on the exact numerical solution to the time-dependent Schrödinger equation of the quasi-electron in solids and can be analytically interpreted with a model based on the principle of the Michelson interferometer. Our finding may find potential applications in imaging of the dispersion relation or topological structure of the energy bands in solids.

        Speakers: Mr Jin Jianzhao (Peking University), Hao Liang (Peking University), Liang-You Peng (Peking University)
      • 18:15
        Microscopic Analysis of the Intensity and Wavelength Dependence of Quantum Path Interferences in High-order Harmonic Generation 2h

        The complex behaviour of the harmonic yield radiated by a single noble gas atom via high-harmonic generation process is investigated as a function of the wavelength, as well as the peak intensity of the fundamental driving field.

        Speaker: Tamás Csizmadia (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:15
        Molecular Auger Interferometry 2h

        We propose a theory of interferometric measurement of a normal Auger decay width in molecules and show analytically that it can be reconstructed from the relative ($\omega/2\omega$) phase scan of the Auger yield modulation.

        Speaker: Margarita Khokhlova (Imperial College London)
      • 18:15
        Momentum Spectroscopy of Cold Rubidium in the Femtosecond Laser Field 2h

        We study photoionization of cold rubidium atoms in a strong infrared femtosecond laser field using a magneto-optical trap (MOT) recoil ion momentum spectrometer. The momentum distributions of Rb$^+$ created by absorption of two- or three-photon illuminate a dipole-like double-peak structure. The yielding momentum resolution of $0.12\pm0.03$ a.u. is achieved in comparison with calculations, exhibiting the great prospects for the study of electron correlations in alkali metal atoms through interaction with strong laser pulses.

        Speaker: Dr Tian-Min Yan (Shanghai Advanced Research Institute, Chinese Academy of Sciences)
      • 18:15
        Monitoring the Moving Electron Wavepacket with Near-forward Rescattering Photoelectron Holography 2h

        By investigating the strong-field photoelectron holographic structure of the superposition state of the H_{2}^{+}, we find a bifurcation structure, from which the transient electron wave-packet can be read out.

        Speaker: Mingrui He (Huazhong University of Science and Technology)
      • 18:15
        Multichannel-resolved Dynamics in Below-threshold Harmonic Generation of Diatomic Molecules 2h

        We present an ab initio quantum study of below-threshold harmonic generation (BTHG) from H$_2^+$ molecules in the presence of an intense laser field by solving the time-dependent Schrödinger equation accurately in space and time. We find that multiple channels contribute to BTHG of H$_2^+$ molecules, which are related to the electron driven initially at specific time of the laser pulse from one nuclear core to another nuclear core or back to the parent core itself. The distinct contributions of these channels are distinguished by using a novel synchrosqueezing time-frequency analysis. An intuitive physical picture discovered reveals electron dynamics in molecular BTHG in details for the first time.

        Speaker: Prof. Peng-Cheng Li (Shantou University)
      • 18:15
        Nanojoule Water Window Soft X-ray Harmonics Source 2h

        We obtain over 3.5 nJ water window soft x-rays by high-order harmonic generation (HHG), which is the strongest in ever reported results by HHG. X-ray absorption fine structure (XAFS) at Carbon k-edge is observed.

        Speaker: Dr Yuxi Fu (RIKEN)
      • 18:15
        Nonlinear Laser Excitation of $^{229m}$Th Isomer State by Two-Color Femtosecond Laser Fields 2h

        It is shown that excitation of the isomeric nuclear state $^{229m}$Th in the process of thorium atom irradiation by two-color field of Ti:Sa can be enhanced significantly with respect to other nucleus excitation processes.

        Speaker: Dr Sergey Stremoukhov (Lomonosov Moscow State University)
      • 18:15
        Optimizing High Harmonic Flux Using Artificial Neural Networks 2h

        An artificial neural network that is able to predict the total harmonic flux in a given spectral range is developed. The accuracy of the model and its prediction capabilities are demonstrated.

        Speaker: Valer Tosa (INCDTIM Cluj Napoca)
      • 18:15
        Optimizing Soft X-Ray High Harmonic Generation 2h

        We simulate high harmonic generation (HHG) from few-cycle mid-infrared (MIR) lasers. We calculate optimum phase matching parameters for attosecond pulses at important soft X-ray edges for low energy driving lasers (< 0.5 mJ).

        Speaker: Mr Timur Avni (Imperial College London)
      • 18:15
        Phase-matching-free Pulse Retrieval Based on Transient Absorption in Solids 2h

        We report a novel metrology tool to characterize femtosecond pulses. It is free of phase matching, enabling to measure pulses with ultra-broadband spectra and very low energy at the limit of the spectrometer detection.

        Speaker: Adrien Leblanc (INRS-EMT)
      • 18:15
        Photo-induced Ultrafast Electron Emission and Photonic Bandgap Engineering in Phosphorene 2h

        We show how the ultrafast photo-induced electron emission processes can reach the order of femtosecond timescale by suitable application of external ultrafast laser. Resulting evolution of the charge densities and emission currents are discussed. Our analysis is general and holds true for other class of two-dimensional materials as well.

        Speaker: Mr Saibabu Madas (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:15
        Photoionization of H$_{2}$ Using the Molecular R-matrix with Time Approach 2h

        In this first application of our newly developed molecular time-dependent R-matrix method we study two- and four-photon ionization cross sections for H$_{2}$ and study the effects of electron correlation and choice of one electron basis.

        Speaker: Zdenek Masin (Charles University)
      • 18:15
        Plasma Compensation of the Attosecond Chirp: The Macroscopic Case 2h

        Chirp compensation of attosecond pulses by propagation in plasma after generation is numerically investigated. We analyze the contributions of plasma dispersion, spatial chirp, and propagation effects on the final pulse characteristics in experimentally feasible configurations.

        Speakers: Katalin Kovacs (INCDTIM Cluj Napoca), Dr Valer Tosa (INCDTIM Cluj Napoca)
      • 18:15
        Polarimetry of a Single-Order Circularly Polarized High Harmonic Separated by a Time-Delay Compensated Monochromator 2h

        Polarization of single-order circularly polarized high harmonic is characterized after the separation by a time-delay compensated monochromator. The ellipticity introduced by the anisotropy of the toroidal gratings in diffraction is evaluated for the compensation.

        Speakers: Mr Kengo Ito (Hokkaido University), Taro Sekikawa (Hokkaido University)
      • 18:15
        Polarization Tagging of Two-photon Double Ionization by Elliptically Polarized XUV Pulses 2h

        We explore the influence of elliptical polarization on the (non)sequential two-photon double ionization of atomic Helium with ultrashort extreme ultraviolet (XUV) light fields using time-dependent full ab initio simulations.

        Speaker: Stefan Donsa (Vienna University of Technology)
      • 18:15
        Potential Shape Dependent Interference Pattern in Photoelectron Spectra Near Cutoff 2h

        We show that the slope of a two-path interference pattern near the cutoff in above-threshold electron energy spectra obtained as a function of carrier-envelope phase is directly related to the shape of the atomic potential.

        Speaker: Mr Yang Hwan Kim (Center for Relativistic Laser Science, Institute for Basic Science, GIST)
      • 18:15
        Probing Ultrafast Molecular Dynamics by Correlated Electron-Nuclear Momentum and Harmonic Spectra 2h

        The molecular structure and ultrafast molecular processes can be decoded from the correlated electron-nuclear dynamics by measuring high-order harmonic generation and photoelectron momentum distributions. Subcycle time resolution can be achieved.

        Speaker: Prof. Xue-Bin Bian (Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences)
      • 18:15
        Progresses in Building a Femtosecond Extreme-ultraviolet (XUV) Comb at WIPM 2h

        In this work, we report on the recent progresses in building an XUV comb at Wuhan Institute of Physics and Mathematics (WIPM).

        Speaker: Dr Linqiang Hua (Institute of Physics and Mathematics, Chinese Academy of Sciences)
      • 18:15
        Quantum Control and Ultrafast Charge Migration in Molecules in the X-ray Regime 2h

        In the present study, we focus on the ultrafast charge migration in the valence shell subsequent to Auger decay of a core-ionized/excited molecule. By using a two-color X-ray attosecond pump-probe scheme, we theoretically demonstrate that we can induce and measure charge migration at different sites of a molecule.

        Speaker: Dr Solène Oberli (Universidad Autónoma de Madrid)
      • 18:15
        Quantum dynamics of the Isomerization of Norbornadiene to Quadricyclane Induced by Strong Attopulses. 2h

        We investigate the [2+2]photo-cycloaddition of norbornadiene to quadricyclane by integrating the nuclear time-dependent Schrödinger equation for eight electronic states, coupled by nonadiabatic coupling and the interaction with an external electric field.

        Speaker: Dr Alessio Valentini (University of Liege)
      • 18:15
        Quasi-real-time Attosecond Streak Camera 2h

        A new attosecond streaking scheme using crossed XUV and IR beams and delay-line detector was proposed to largely shorten the experimental time to realize quasi real time characterization of attosecond pulses.

        Speaker: Mr Peng Xu (Xi’an Institute of Optics and Precision Mechanics of CAS)
      • 18:15
        Reconstruction of Laser Pulses Measured Using a Tunneling Ionization Method 2h

        We present a reconstruction algorithm for the temporal characterization method called as tunneling ionization with a perturbation for the time-domain observation of an electric-field (TIPTOE). The algorithm can be broadly applied for various laser pulses.

        Speaker: Prof. Kyung Taec Kim (IBS / GIST)
      • 18:15
        Relativistic Non-dipole Effects in Strong Field Ionization 2h

        We present results of the theoretical and experimental study of the relativistic non-dipole effects in the strong field atomic ionization of Argon in the intensity range of $10^{14}$ -$10^{15}$ W/cm$^2$.

        Speakers: Dr Igor Ivanov (Centre for Relativistic Laser Science, Institute for Basic Science), Prof. Kyung Taec Kim (Centre for Relativistic Laser Science, Institute for Basic Science)
      • 18:15
        Revelation of Properties of the Plasmonic Field Using Bichromatic Circularly Polarized Laser Fields 2h

        Plasmonically enhanced field exhibits a great potential to extend the energy-cutoff of the high-order harmonic generation (HHG). In addition, in recent years, circularly polarized harmonics were generated using bichromatic circularly polarized laser fields. In this work, we combine the two approaches and study the HHG process driven by plasmonically enhanced bichromatic circularly polarized laser fields. We show that not only the harmonic energy-cutoff is increased, but also that the polarization of emitted harmonics becomes energy dependent. This dependence is determined by the direction and the strength of the applied plasmonic field.

        Speaker: Ms Irfana Neyaz Ansari (Indian Institute of Technology Bombay)
      • 18:15
        Role of Quantum-path Interference in High Harmonic Generation from Solids 2h

        We introduced an intra- and intercycle interference model in the $k$ space to reveal the yield modulations in high-order harmonic generation (HHG) processes in solid crystals.

        Speaker: Xue-Bin Bian (Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences)
      • 18:15
        Sensitive Detection Scheme for Attosecond Transient Absorption Spectroscopy 2h

        We demonstrate a sensitive attosecond transient absorption scheme based on the balanced detection principle. We also find that the dominant noise source is the laser intensity fluctuation which causes a blueshift of the harmonic spectra.

        Speaker: Mikhail Volkov (LMU Munich)
      • 18:15
        Single-Shot Imaging of Electron Band Structure by All-Optical Temporal Interferometry 2h

        We propose a method for single-shot imaging of electron band structure. The electron band structure is encoded in the carry-envelope-phase (CEP) dependent frequency-shift of high harmonic radiation generated by a few-cycle laser field. By analyzing the quantum trajectories, the relation between electron band structure and frequency of the emitted radiation is established with a temporal two-slit interference. Based on this time-domain interferometry, the electron band structure can be retrieved from high harmonics with a few-cycle laser field in a given CEP. Our single-shot measurement paves the way to imaging the ultrafast transient modification to band structure.

        Speaker: Mr Liang Li (Huazhong University of Science and Technology)
      • 18:15
        Soft X-ray Absorption Spectroscopy of Molecules in Solution with a Table-top Femtosecond High Harmonic Source 2h

        We present first soft X-ray absorption spectra of solvated organic molecules and inorganic salts recorded with a broadband high harmonic source delivering soft X-ray pulses in a photon energy range between 270 eV and 450 eV.

        Speaker: Dr Arnaud Rouzée (Max Born Institute)
      • 18:15
        Soliton Enhancement Cavities 2h

        We report temporal soliton formation in a free-space enhancement cavity. Enabled by a spectrally tailored input coupler, a self-stabilizing 37-fs cavity soliton was driven by 350-fs laser pulses at a peak power enhancement of 3200.

        Speaker: Maximilian Högner (Max-Planck-Institut für Quantenoptik)
      • 18:15
        Spectral Broadening of a 500W, 5mJ Femtosecond Laser 2h

        In this contribution, we present a significant up-scaling of the average power of stretched hollow-core-fibers by spectrally broaden 5 mJ, 500 W, 280 fs pulses in a 4 m long, 450 $\mu$m inner-diameter fiber to a bandwidth supporting sub-17fs pulses.

        Speaker: Dr Steffen Hädrich (Active Fiber Systems GmbH)
      • 18:15
        Spectral Shifts in Mid-infrared Assisted High-order Harmonic Generation in Gases 2h

        We study high-order harmonic generation in a two-color configuration. Additionally to yield enhancement, cut-off extension and continuum generation, we report and explain a spectral shift of harmonic peaks controlled by the delay between the pulses.

        Speaker: Balázs Major (ELI-ALPS, ELI-HU Non-Profit Ltd., University of Szeged)
      • 18:15
        Steering the H$_{2}$CSO Sulfine's Photochemistry with Few-Cycle Pulses: A Computational Study 2h

        We demonstrate the ability of intense few-cycle pulses to steer photochemical reactions by taking advantage of their ultrashort nature to dynamically tailor potential energy surfaces and to induce a radiative dumping in an ultrafast pump-dump scheme.

        Speaker: Benoit Mignolet (University of Liege)
      • 18:15
        Strong 50-attosecond Water Window Pulses by a Midinfrared Waveform Synthesizer 2h

        Using 100-mJ-class midinfrared laser pulses, that are generated by a dual-chirped optical parametric amplification (DC-OPA) system, for a multi-channel waveform synthesizer, strong ‘water window’ soft x-ray harmonics with 50-attosecond duration can be generated.

        Speaker: Dr Eiji J. Takahashi (RIKEN)
      • 18:15
        Strong Field Photoelectron Holography by Multi-cycle Counter Rotating Bicircular Laser Field 2h

        Our previous works reveal structure information, dynamics of valence electron, and tunneling ionization time can be encoded in the hologram in photoelectron momentum distribution (PEMD) and how to extract them. Recently, we study photoelectron holography in multicycle strong counter rotating laser fields by solving time dependent Schrodinger equation (TDSE).

        Speaker: Qinghua Ke (Huazhong University of Science and Technology)
      • 18:15
        Sub-cycle Time Resolution of Multi-photon Momentum Transfer in Strong-field Ionization 2h

        We experimentally demonstrate that the strong-field momentum transfer in laser propagation direction from the field onto the photoelectrons is a time-dependent process within an optical cycle. The observation can mostly be explained with a classical model of a free electron in a laser field, extended by the parent ion interaction and an additional time-dependent initial momentum shift.

        Speaker: Benjamin Willenberg (ETH Zurich)
      • 18:15
        Symmetry of Molecular Rydberg States Revealed by Attosecond Transient Absorption Spectroscopy 2h

        We applied attosecond transient absorption spectroscopy to probe aligned N$_{2}$ and O$_{2}$ molecules. The direction of the electronic transitions was determined and the symmetry of the final states was identified.

        Speaker: Dr Peng Peng (National Research Council and University of Ottawa)
      • 18:15
        Table-top High Energy 7 µm OPCPA for Strong Field Physics 2h

        We present the development of a 0.7 mJ pulse energy, 188 fs pulse duration 7 µm OPCPA at 100 Hz and we show the generation of high harmonics in ZnSe covering all the visible and near-infrared regime.

        Speaker: Ugaitz Elu (ICFO)
      • 18:15
        Temporal Characterization of a Two-color Laser Field Using the Tunneling Ionization Method 2h

        The temporal characterization of a two-color laser field is performed using the tunneling ionization method. It is shown that the waveform of the laser field is successfully reconstructed from the modulation of the ionization yield.

        Speaker: Mr Jeong-uk Shin (Gwangju Institute of Science and Technology)
      • 18:15
        Terahertz Yield from ZnO Crystal Driven by Strong Laser Pulse 2h

        We theoretically investigate the Terahertz emission from ZnO using the Semiconductor Bloch equations. The relation between the laser intensity and THz yield is unexpected, which is closely related to the band structure and Bloch oscillation.

        Speaker: Dr Lu Liu (Graduate School of China Academy of Engineering Physics)
      • 18:15
        The Role of the Time Delay in the Reflection and Transmission of Ultrashort Electromagnetic Pulses on a System of Parallel Current Sheets 2h

        The reflection and transmission of a few-cycle laser pulse impinging on two parallel thin metal layers have been analyzed. This study means a generalization of an earlier work, in which the role of the collective radiative back-reaction of one layer has been derived.

        Speaker: Mónika Polner (ELI-ALPS, ELI-HU Non-profit Ltd.)
      • 18:15
        The Three-dimensional Carrier-envelope-phase Map of Focused Few-cycle Pulsed Gaussian Beams 2h

        We derive an analytical expression for the complete three-dimensional carrier-envelope-phase (CEP) distribution in the focal volume of ultrashort pulsed beams. We show how to tailor the CEP map of mirror-focused and lens-focused few-cycle pulses practically.

        Speaker: Dr Balázs Major (ELI-ALPS, ELI-HU Non-Profit Ltd., University of Szeged)
      • 18:15
        Theoretical Investigation of Resonant High-Harmonic Generation from Transition Metal Plasma Based on First-Principles Method 2h

        Resonant high-harmonic generation (rHHG) offers an attractive way for increasing conversion efficiency at the resonant energy. In this work, we theoretically investigate the physical origin of resonant enhancement from atomic Mn and its cation and have found that the enhancement is attributable to a constructive interference between 3p-3d transition components.

        Speaker: Mr Imam S. Wahyutama (The University of Tokyo)
      • 18:15
        Time-Resolved Exchange Interaction in Noble Gas Ionization 2h

        With the recollisional imaging enabled by the above-threshold ionization process, we induce and study exchange interaction, temporally and spatially resolved.

        Speaker: Dr Stefanos Carlström (Max Born Institute)
      • 18:15
        Topological Strong Field Physics on Sub-laser Cycle Timescale 2h

        Topological state is linked with dynamics, as manifested via chiral-edge currents. But is there an inherent timescale, associated with topology? We address this question using unique properties of primary electronic response to strong optical fields.

        Speaker: Dr Álvaro Jiménez-Galán (Max-Born-Institut)
      • 18:15
        Two-color Double-hand Attoclock Photoelectron Interferometry 2h

        We use the two-color (400 nm + 800 nm) co-rotating circularly polarized laser fields to ionize argon atoms. In this double-hand attoclock, we introduce a spatially rotating temporal Young’s two-slit interferometer with the variable slit width, in which the oppositely modulated wave packets originating from consecutive laser cycles are dynamically prepared and interfered. Developing a Fourier-transform algorithm on energy-resolved photoelectron interferograms, we can directly extract the amplitude and the phase of emitting electron wave packets from strong-field ionization.

        Speakers: Dr Meng Han (Peking University), Prof. Yunquan Liu (Peking University)
      • 18:15
        Two-colour Interferometer for Field Synthesis and Attosecond Streaking 2h

        We present a two-colour femtosecond field synthesiser deployed in attosecond streaking measurements at surfaces.

        Speaker: Mr Bruce Weaver (Imperial College London)
      • 18:15
        Ultrafast Dynamics in Polythiophene Probed with Transient Absorption Spectroscopy at the Sulphur L$_{2,3}$ Edge 2h

        We present results from transient absorption spectroscopy measured with a HHG generated supercontinuum at the sulphur L$_{2,3}$-edge of poly(3-hexylthiophene) (P3HT) following single photon excitation at the $\pi - \pi^{*}$ resonance.

        Speaker: Douglas Garratt (Imperial College London)
      • 18:15
        Ultrafast Exciton Buildup in Monolayer MoS$_2$ 2h

        We study the ultrafast relaxation of excited carriers into the lowest lying excitonic state of monolayer MoS$_2$ after excitation with $\approx$ 20fs laser pulses with different carrier frequencies using a density-matrix-formalism including many-body effects and electron-phonon scattering from ab-initio calculations.

        Speaker: Valerie Smejkal (Vienna University of Technology)
      • 18:15
        Ultrafast Hole Migration Resolved in Space and Time 2h

        In this work, we report the first direct measurement of a short lived hole wavepacket migration (lifetime of ~15fs) in the isopropanol molecule (C$_{3}$H$_{8}$O) by means of an X-ray pump, X-ray probe scheme with a few femtosecond time resolution at the LCLS XFEL facility.

        Speaker: Dr Thomas Barillot (EPFL)
      • 18:15
        When Light-induced Fano Profiles Meet the Condensed Phase 2h

        We demonstrate a universal feature on attosecond X-ray transient absorption spectra that emerges from the light-induced coherent intraband dynamics. This feature is linked to previous studies of light-induced Fano resonances in atomic systems.

        Speaker: Antonio Picon (UAM)
      • 18:15
        XUV Pulse Amplification in High-harmonic Generation in Argon 2h

        We report on the amplification of XUV pulses in the frame of high-harmonic generation in argon. By synchronizing a strong IR femtosecond light pulse with a weak XUV attosecond pulse, our single-atom simulations explain the observed amplification in the 26 - 45 eV photon energy region.

        Speaker: Dr Carles Serrat (Universitat Politecnica de Catalunya)
      • 18:15
        XUV-Assisted High-Order-Harmonic-Generation Spectroscopy 2h

        High harmonic generation is analyzed in an intense IR- and weak XUV- fields. Multiple plateaus in harmonic spectra are discussed in terms of XUV-assisted multiphoton photorecombination cross section (PRCS). Multiphoton PRCS retrieving procedure is suggested.

        Speaker: Dr Tatiana S. Sarantseva (Voronezh State University)
    • 08:30 10:15
      High-harmonic generation in solids and liquids: #4
      • 08:30
        Fundamentals of High-harmonics from Solids 30m

        This talk provides a brief overview of recent progress in understanding the fundamentals of solid-state HHG. It also includes details of an experiment, where a robust interferometric approach is employed to characterize high-harmonics from bulk crystals.

        Speaker: Dr Shambhu Ghimire (Stanford PULSE Institute, SLAC National Accelerator Laboratory)
      • 09:00
        Terahertz Lightwave Control of Solids and Single Molecules 30m

        We switch the valley pseudospin in monolayer WSe2 and drive all-ballistic Dirac currents on a topological insulator on subcycle scales. A lightwave-driven scanning-tunneling microscope allows for the first-ever femtosecond single-molecule videography and reaction microscopy.

        Speaker: Prof. Rupert Huber (University of Regensburg)
      • 09:30
        Generation of EUV Pulses from Liquid Sheets 15m

        Extreme ultraviolet (EUV) pulses are produced through high-order harmonic generation in few micrometre thick liquid sheets operating in vacuum. The underlying mechanisms, including the extent of generation in liquid rather than surrounding gas, are characterized by scanning a number of laser and target parameters.

        Speaker: Mrs Mary R. Matthews (Imperial College London)
      • 09:45
        Mapping Electric Fields with Solid-state High Harmonic Generation 15m

        In centrosymmetric materials, even order harmonics that are normally forbidden can be produced in the presence of a symmetry-breaking electric field. This allows optical measurements of fields in semiconductors with high temporal and spatial resolution.

        Speaker: Dr Marco Taucer (National Research Council Canada)
      • 10:00
        Ionization-driven Harmonic Generation in Solids 15m

        Recently, we have observed the generation of ionization harmonics by irradiating a fused silica sample with an intense (TW/cm$^2$ range) pump laser beam. We established that in our experiments, the conventional mechanism of Brunel-type emission only plays a marginal role in the production of ionization harmonics.

        Speaker: Dr Anton Husakou (Max Born Institute)
    • 10:15 10:45
      Coffee 30m
    • 10:45 13:00
      New installations and next generation drivers for ultrashort XUV radiation: #1
      • 10:45
        Temporal Characterization of FEL-driven Attosecond Pulses 30m

        We will present the first temporal characterisation of reproducible attosecond pulses generated by a Free Electron Laser.

        Speaker: Prof. Giuseppe Sansone (Albert-Ludwigs-University Freiburg)
      • 11:15
        OPCPA System Delivering 5-TW, 2.1-cycle, CEP stable Pulses at 1 kHz Repetition Rate 15m

        We demonstrate a high peak- and average power OPCPA system producing 2.1-cycle pulses at 875 nm. Short pulse duration is achieved by using amplification stages with different nonlinear crystals and different noncollinearity and phase matching angles.

        Speaker: Dr Tomas Stanislauskas (Light Conversion)
      • 11:30
        Generation of 0.3-TW Few-cycle Driver Pulses via Efficient Cascaded Raman Frequency Down Conversion 15m

        We demonstrate a highly efficient, single-stage, SRS-enabled cascaded frequency down-conversion to generate high-energy, few-cycle, IR pulses. 10 mJ, 220 fs pulses at 1030 nm are red-shifted to 1230 nm in a 5.5 m-long, nitrogen-filled waveguide with 82.5% efficiency, and subsequently compressed down to 19 fs.

        Speaker: Guangyu Fan (TU Wien)
      • 11:45
        Broadband Intense THz Fields from Mid-IR Laser-Driven Plasma 15m

        We report on intense THz generation in two-color laser filaments driven by $3.9\ \mathrm{\mu m}$ pulses. The resulting extraordinary conversion efficiency of 2.34% is more than one order of magnitude higher as compared to conventional NIR drivers. The generated THz pulse energy of 0.185-mJ is sufficient for nonlinear perturbation of electro-optical crystals.

        Speaker: Claudia Gollner (TU Wien)
      • 12:00
        Multi-XUV-photon Multiple Ionization by 20 GW High-harmonic Pulses 15m

        Here, we demonstrate a lab scale high-harmonic-generation source, installed and operating at the attosecond science & technology lab of FORTH-IESL delivering pulse energies of ~230 μJ and ~130 μJ in the ~50 nm spectral range from Xenon and Argon, respectively, in a quasi phase-matched dual gas-jet configuration. XUV pulses of this source have been used to observe multiple ionization of Argon atoms up to Ar$^{4+}$.

        Speaker: Mr A Nayak (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 12:15
        Ultrafast Lensless Imaging using High Harmonic Generation: from Attosecond Broadband to 3D Stereo 15m

        We report on two recent demonstrations on attosecond broadband and 3D imaging.

        Speaker: David Gauthier (CEA-Saclay)
      • 12:30
        ELI-ALPS Research Institute Opens Its Gates 30m

        We give a short overview on the available laser and secondary sources and on the Friday mini-workshop’s program of the conference hosted by ELI-ALPS Research Institute.

        Speaker: Dr Katalin Varjú (ELI-ALPS, ELI-HU Non-Profit Ltd.)
    • 13:00 13:30
      Group photo 30m
    • 08:30 10:15
      Transient absorption and XUV spectroscopy of atoms and molecules: #13
      • 08:30
        XUV Excited-State Dynamics of a Two-Electron System in Strong Fields 30m

        The correlated electron dynamics of doubly excited states in helium can be controlled with strong fields, state resolved via transient absorption spectroscopy. Nonlinear absorption spectroscopy with intense XUV FEL pulses gives access to phase shifts due to dressed-state dynamics.

        Speaker: Christian Ott (Max-Planck-Institut für Kernphysik)
      • 09:00
        Direct Imaging of Curve-crossing Dynamics in IBr by Attosecond Transient Absorption Spectroscopy 15m

        We perform attosecond transient absorption spectroscopy (8-fs-visible pump, 200-as-XUV probe) to measure nonadiabatic dynamics of iodine monobromide. The results visualize the switching of unoccupied-orbital character from $\sigma^{*}$ to $\pi/\pi^{*}$ ensuing at the avoided crossing.

        Speaker: Yuki Kobayashi (UC Berkeley)
      • 09:15
        Transient Absorption Ion Spectroscopy with XUV-FEL Pulses 15m

        We investigate transient (2.4-fs time scale) coherence effects imprinted on the electronic level structure of the doubly-charged neon ion caused by the nonlinear interaction with intense extreme-ultraviolet free-electron-laser radiation under the influence of its stochastic time structure.

        Speaker: Thomas Ding (Max-Planck-Institut für Kernphysik)
      • 09:30
        Attosecond Transient Absorption of Molecular Core-excited States: Core-hole Lifetime Dependence on Orbital Alignment Relative to Molecular Bond 15m

        Using attosecond transient absorption (ATAS), core-excited state lifetimes of iodine monochloride are retrieved, with additional detail about the orientation of the core excited state orbital relative to the bond direction.

        Speaker: Dr Hugo Marroux (UC Berkeley)
      • 09:45
        Soft X-Ray Attosecond Spectroscopy at an FEL: Molecular Photoionization and Auger Emission Dynamics 15m

        Using high pulse energy soft X-ray attosecond pulses, we investigate ultrafast molecular photoionization and Auger emission dynamics near and beyond the O $K$-edge of NO via angular streaking with a co-linear velocity map imaging spectrometer.

        Speaker: Elio Champenois (SLAC National Accelerator Laboratory)
      • 10:00
        Extracting Dynamics from the HHG Spectra of Polyatomic Molecules 15m

        The ultrafast evolution of a molecule following ionisation in a strong laser field is a central problem in attosecond science. Here we extend the method of high harmonic generation spectroscopy (HHGS) to extracting these dynamics in a way that is robust and general.

        Speaker: Jon Marangos (Imperial College London)
    • 10:15 10:45
      Coffee 30m
    • 10:45 12:30
      Ultrafast spectroscopy of electronic and magnetic processes in solids: #8
      • 10:45
        Attosecond Science: From Basic Research to Cancer Detection 30m

        Born around the turn of the new millennium, attosecond metrology has provided real-time insight into atomic-scale electron motions and light field oscillation, previously inaccessible to human observation. Until recently, this capability has relied on attosecond extreme ultraviolet pulses, generated and measured in complex vacuum systems. Next-generation attosecond metrology is now about to change this state of matters profoundly. Sub-femtosecond current injection into wide-gap materials can directly probe ultrafast electron phenomena in condensed matter systems and can also be used for sampling the electric field of light up to ultraviolet frequencies. Petahertz field sampling draws on a robust solid-state circuitry and routine few-cycle laser technology, opening the door for complete characterization of electromagnetic fields all the way from the far infrared to the vacuum ultraviolet. These fields, with accurately measured temporal evolution, serve as a unique probe for the polarization response of matter. Field-resolved spectroscopy will access valence electronic as well as nuclear motions in all forms of matter and constitutes a generalization of pump-probe approaches. Its implementation with a solid-state instrumentation opens the door for real-world applications, such as early cancer detection by measuring miniscule changes of the molecular composition of blood via field-resolved vibrational molecular fingerprinting.

        Speaker: Ferenc Krausz (Max-Planck-Institut für Quantenoptik)
      • 11:15
        Ultrafast Demagnetization Probed by Attosecond Diffraction Spectroscopy 15m

        Broadband attosecond pulses are employed for multimodal probing of the structural response and the magnetic order in Co-Pt magnetic multilayers following ultrafast photoexcitation observing that the onset of demagnetization is time-delayed by approximately 4 fs.

        Speaker: Dr Michael Zürch (Fritz Haber Institute of the Max Planck Society)
      • 11:30
        Transient Attosecond Soft-X-Ray Spectroscopy in Layered Semi-Metals 15m

        In this work we use a high harmonic light source capable of producing single attosecond soft-xray pulses to study the ultrafast electronic and structural dynamics of layered semi-metals.

        Speaker: Dr Themistoklis Sidiropoulos (ICFO)
      • 11:45
        Role of Effective Mass in Attosecond Time-resolved Photoemission from the Non-centrosymmetric Crystal BiTeCl 15m

        Attosecond time-resolved photoemission experiments on the non-centrosymmetric crystal BiTeCl provide evidence that the observed dynamics of photoemission is significantly influenced by the effective electron mass in the final states.

        Speaker: S. Neb (Bielefeld University)
      • 12:00
        Sub-cycle Quantum Electrodynamics of Strongly Laser Driven Materials 15m

        I will describe how the strong-field laser-matter interaction can lead to the generation of non-classical lightstates which carry the information of the ultrafast dynamics of the interaction.

        Speaker: Dr Paraskevas Tzallas (Foundation for Research and Technology-Hellas, ELI-ALPS, ELI-HU Non-profit Ltd.)
      • 12:15
        Interface-sensitive Spectroscopy with Broadband Attosecond Pulses 15m

        Broadband attosecond pulses are used for interface-sensitive scattering spectroscopy. Using a patterned silicon structure, the response of a 1.5 nm-thick native oxide layer is isolated. Attosecond transient reflectivity measurements are then performed on this system.

        Speaker: Romain Geneaux (UC Berkeley)
    • 12:30 14:00
      Lunch 1h 30m
    • 14:00 15:45
      High-harmonic spectroscopy of molecular processes: #12
      • 14:00
        Ultrafast Phenomena in Bio-Relevant Molecules Promoted by Attosecond Excitation 30m

        Extreme-ultraviolet attosecond pulses are ideal tools for the investigation of ultrafast processes initiated by ionizing radiation in biologically-relevant structures on various timescales, ranging from the attosecond to the few-femtosecond domain.

        Speaker: Mauro Nisoli (Politecnico di Milano)
      • 14:30
        Unfolding the Physics of Shape Resonances in the Photoionization of N$_{2}$O 15m

        We experimentally resolve the complex, angle-dependent attosecond photoionization dynamics in the presence of a molecular shape resonance (SR) in N$_{2}$O, theoretically supported using quantum scattering methods.

        Speaker: Prof. Hans Jacob Wörner (ETH Zürich)
      • 14:45
        Visualizing Molecular Unidirectional Rotation with High-harmonic Generation 15m

        An angle-resolved high-harmonic spectroscopy is demonstrated to probe the molecular unidirectional rotation. The rotational dynamics is directly visualized from the time-delay-dependent angular distributions and frequency shift of the generated harmonics.

        Speaker: Prof. Pengfei Lan (Huazhong University of Science and Technology)
      • 15:00
        Ultrafast Ring-Opening Dynamics of 1,3-Cyclohexadiene Probed via Time-Resolved High-Harmonic Spectroscopy 15m

        We demonstrate the simultaneous observation of the electronic and vibrational dynamics of the photo-isomerizing 1,3-cyclohexadiene via time-resolved high-harmonic spectroscopy. The observed attosecond high-harmonic interference reveals how the excited-state ionization potential evolves along the reaction coordinate.

        Speaker: Keisuke Kaneshima (Hokkaido University)
      • 15:15
        Electron Correlation Driven Non-adiabatic Relaxation in 2D Molecular Structures Following Excitation by an Ultrashort XUV Pulse 15m

        We used time-resolved XUV-IR photoelectron spectroscopy to probe the ultrafast dynamics in highly excited large carbon based molecules. Our results show evidences of manybody driven relaxation and electro-nuclear coherences. Analogies with the behaviour of 2D materials will be presented.

        Speaker: Marius Herve (ILM (Lyon))
      • 15:30
        Real-Time Imaging of Ultrafast Charge Dynamics in CF$_{4}$ Molecule from Attosecond Pump-Probe Photoelectron Spectroscopy 15m

        Attosecond spectroscopy offers the possibility to track and control electron dynamics in molecules. We are reporting here a theoretical description of an attosecond pump-probe experiment on CF$_{4}$ showing clear evidences of a complex dynamics due to ultrafast charge fluctuations.

        Speaker: Dr Etienne Plesiat (Universidad Autónoma de Madrid)
    • 15:45 16:15
      Coffee 30m
    • 16:15 18:00
      Time delays and dynamics of photoionization in atoms and molecules: #14
      • 16:15
        Photoionization Dynamics Probed by Attosecond Pulses 30m

        We introduce the concept of photoionization time delay and present measurements in different atomic systems, with high spectral resolution. Both non-resonant and resonant photoionization dynamics will be considered.

        Speaker: Prof. Anne L'Huillier (Lund University)
      • 16:45
        Fano's Propensity Rule in Angle Resolved Attosecond Pump-probe Photionization 15m

        We extend Fano’s propensity rule to two-photon above-threshold ionization and apply it to angle-resolved attosecond interferometry. This results in incomplete interference which lead to angle-dependent photoionization time delays and delay-dependent photoelectron angular distributions.

        Speaker: David Busto (Lund University)
      • 17:00
        RABBITT Attoclock for the Direct Measurement of Ionization Phases 15m

        Using a circularly polarized Attosecond Pulse Train (APT) together with a weak replica of the circularly polarized fundamental Infra-Red (IR) we reconstruct the ionization phase of the (2s2p)$^1$P$^{\mathrm{o}}$ resonance in atomic Helium by analyzing the photelectron momentum distribution.

        Speaker: Stefan Donsa (Vienna University of Technology)
      • 17:15
        Atomic and Orientation-Dependent Molecular Ionization Times from an Attoclock with Bicircular Fields 15m

        Tailored bicircular fields mimic linearly polarized light three times per period, while avoiding recollision and interferences. Combined with streaking, we extract momentum-dependent times of strong-field ionization even in the previously inaccessible range of rising field.

        Speaker: Prof. Manfred Lein (Leibniz Universität Hannover)
      • 17:30
        Time Delays from One-photon Transitions in the Continuum 15m

        We experimentally resolve a time delay of electron wave packets arising from one-photon transitions in the continuum. This proves the influence of the outgoing wave packet spatial expansion on the photoionization delay.

        Speaker: Mr Jaco Fuchs (ETH Zürich)
      • 17:45
        Attosecond Photoionization Delays around the Argon Cooper Minimum 15m

        Photoionization time delays between the 3s and 3p subshells of argon have been measured over a large energy range (34-70 eV) covering the Cooper minima in both subshells, providing stringent tests for interchannel correlation theories.

        Speaker: Mr Dominique Platzer (CEA, CNRS, Université Paris-Saclay)
    • 18:00 20:00
      Poster session 2: Wednesday poster session with sandwiches

      Wednesday poster session

      • 18:00
        A Gauge-Invariant Approach to Interband and Intraband Currents 2h

        In solids, the separation of the nonlinear current into intraband and interband parts is essential to understanding, but was recently shown to be gauge-dependent in its usual formulation. Here, we propose a new, gauge-invariant formulation.

        Speaker: Marco Taucer (National Research Council Canada)
      • 18:00
        A Geometric Perspective of Photoelectron Circular Dichroism 2h

        We develop the theory of photoelectron circular dichroism from a geometric perspective, uncover its connection to Berry-curvature effects in solids, and provide formulas for aligned and anti-aligned molecular ensembles.

        Speaker: Mr Andres Ordonez (Max Born Institute)
      • 18:00
        A Real-Space Perspective On High Harmonic Generation In Solids 2h

        We theoretically investigate high-harmonic generation in a 1D crystal in the natural real-space basis for periodic systems, the Wannier states. A full quantum simulation confirms our semi-classical model and its interpretation.

        Speaker: Guilmot Ernotte (University of Ottawa)
      • 18:00
        Ab Initio Approach to Ultrafast Spectroscopy with Stochastic Time-Dependent Density Functional Theory and Gauge-Including Projector Augmented Wave Method 2h

        We extend the gauge-including projector augmented wave method to the case of time-dependent electric fields of arbitrary strength and present its implementation in the VASP code. Interaction with an environment is described within the stochastic approach.

        Speaker: Stanislav Kruchinin (Universität Wien)
      • 18:00
        An Intense Attosecond Light Source for Time-resolved Photodissociation Studies in Large Molecules 2h

        I will present an overview of the Intense XUV Beamline at the Lund Laser Centre including the specifications and experimental possibilities, as well as a general outlook about ongoing developments. In addition, I will give insights into experimental results of photo-dissociation of the simplest diamondoid adamantane (C$_{10}$H$_{16}$, m=136 u), which plays a role in astrophysics and biology.

        Speaker: Mr Jasper Peschel (Lund University)
      • 18:00
        Analysis of Photoionization Time Delay Using R-matrix Method 2h

        Using the R-matrix method, we systematically analyze the photoionization time delay of Ne. Photoionization time delay between 2p and 2s shell at 106 eV photon energy is 24.75 as, which agree well with the experimental result $21\pm5$ as.

        Speaker: Dr Jinlei Liu (National University of Defense Technology)
      • 18:00
        Angle-resolved Photoemission Delays in Noble Gases and Molecules 2h

        Utilizing a 1.3 mJ, 100 kHz light source, angle-resolved RABBITT measurements investigate the variation of photoionization delays as a function of photoemission direction in noble gases and molecules.

        Speaker: Mr Daniel Hammerland (ETH Zürich)
      • 18:00
        Angularly Resolved RABBITT at 2$\omega$: Attosecond Pulses Measurement & Attosecond Signature of the 1s3p Resonance of Helium 2h

        The RABBITT method dressed by a 2$\omega$ field provides a similar information as the original RABBITT method. An attosecond pulse train is measured and macroscopic effects around the 1s3p resonance of Helium are highlighted.

        Speakers: Dr Vincent Loriot (ILM (Lyon)), Marius Herve (ILM (Lyon))
      • 18:00
        Angularly Resolved Two-photon Above-threshold Ionization of Helium 2h

        We theoretically explore the contribution of radial and angular electron correlation terms in the two-photon single ionization of helium, by a full dimensional numerical solution of the time dependent Schrödinger equation, over a wide photon energy range.

        Speaker: Dr Diego I. R. Boll (Universidad Autónoma de Madrid)
      • 18:00
        Artifact-free XUV Coherence Tomography by One-dimensional Phase Retrieval 2h

        We present XUV Coherence Tomography (XCT) driven by a high-harmonic light source. Using a novel One-dimensional phase retrieval algorithm, XCT enables non-destructive, artifact-free, nanoscale, cross-sectional imaging of silicon based samples, e.g., semiconductor devices.

        Speaker: Martin Wünsche (Friedrich Schiller University Jena)
      • 18:00
        Asymmetry of the Photoelectron Momentum Distribution from Molecular Ionization in Elliptically Polarized Laser Pulses 2h

        We theoretically study the photoelectron momentum distributions (PMDs) of H$_2^+$ in elliptically polarized laser fields. Depending on the internuclear distance of H$_2^+$ by numerically solving the time-dependent Schördinger equation (TDSE), the PMDs reveal different asymmetries with respect to the major and minor axes of the laser ellipse.

        Speaker: Dr Yanan Qin (Huazhong University of Science and Technology)
      • 18:00
        ATTOLAB SE10: a Versatile and Integrated Beamline for Attosecond Physics on Gases and Surfaces 2h

        After a technical description of the beamline, the first two experimental campaigns achieved in 2018, and preliminary results, will be briefly presented.

        Speaker: David Bresteau (Université Paris-Saclay, CEA Saclay)
      • 18:00
        Central Laser Facility Artemis Upgrade: New Capabilities for X-Ray Spectroscopy 2h

        We present designs and specifications of the Artemis ultrashort extreme ultraviolet laser facility upgrade consisting of a boosted Ti:sapphire chirped pulse amplifier, 100 kHz optical parametric chirped pulse amplifier and an additional high harmonic beam line.

        Speaker: Dr Adam Wyatt (Central Laser Facility)
      • 18:00
        CEP-stabilized, sub-18fs, 10kHz and TW-class 1kHz Dual Output Ti:Sa Laser with Wavelength Tunability Option 2h

        We present a CEP-stabilized, sub-20fs Ti:Sa laser delivering 1 TW peak power pulses at 1 kHz and 20 W average power at 10 kHz. Its output wavelength is tunable within a 90 nm range around 800 nm.

        Speaker: Dr Anna Golinelli (Amplitude Laser Group)
      • 18:00
        Characterization of Attosecond Pulse Train using RABBITT Technique 2h

        In this work, a detailed description on the characterization of attosecond light pulses using the RABBITT (Reconstruction of Attosecond Beating By Interference of Two-photon Transitions) technique along with frequency chirp of attosecond pulses is presented.

        Speaker: Harshitha Nandiga Gopalakrishna (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:00
        Coherent Control of Extreme-ultraviolet Emission Generated through Frustrated Tunneling Ionization 2h

        We report that the spatial profile of an extreme-ultraviolet emission generated through frustrated tunneling ionization can be coherently controlled by manipulating the quantum paths of electron wavepackets in a strong laser field.

        Speaker: Dr Hyeok Yun (Institute for Basic Science)
      • 18:00
        Coherent Synchrotron Emission Source from Few Cycle Laser Driven Relativistic Surface 2h

        Interaction of intense femtosecond laser pulses with solid surface provides a promising opportunity to reach ultrashort radiation in XUV region of the spectrum efficiently. A comprehensive insight into this direction is provided.

        Speaker: Mojtaba Shirozhan (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:00
        Cooper Minimum in Singly Ionized and Neutral Argon 2h

        In the present study we employ two computational approaches of R-matrix technique to investigate the appearance of the Cooper minimum (CM) in singly ionized argon in both the photoionization cross-section (PICS) and high-harmonic generation (HHG) spectrum.

        Speaker: Dr Ola Hassouneh (The University of Jordan )
      • 18:00
        Decomposition of AC Stark Effect and Interference Signals in the Temporal and Spectral Response in Attosecond Transient Absorption Spectroscopy 2h

        Attosecond Transient Absorption Spectroscopy (ATAS) of core-excited states provides the opportunity to study these induced dipoles on their natural timescale from the local perspective of a reporter atom. We show how Singular Value Decomposition (SVD) can be used to separate and decompose signals from different phenomena in ATA.

        Speaker: Lorenz Drescher (Max Born Institute)
      • 18:00
        Detecting and Characterizing the Nonadiabaticity of Laser-Induced Quantum Tunneling 2h

        We propose and demonstrate a novel scheme to detect the nonadiabatic behavior of tunnel ionization studied in an attoclock configuration, without counting on the laser intensity calibration or the modeling of the Coulomb effect.

        Speaker: Siqiang Luo (Huazhong University of Science and Technology)
      • 18:00
        Detection of Electronic and Lattice Dynamics through Attosecond X-ray Absorption Spectroscopy 2h

        We present soft x-ray attosecond spectroscopy for simultaneous observation of electronic and lattice dynamics.

        Speaker: Mr Nicola Di Palo (ICFO)
      • 18:00
        Dual Self-diffraction Dispersion-scan: Characterizing Ultrashort Ultraviolet Pulses in Inhomogeneous Beams 2h

        We present a variation of the self-diffraction dispersion-scan technique and apply it in the simultaneous characterization of two pulses derived from an inhomogeneous near-UV beam.

        Speaker: Mr Miguel Canhota (IFIMUP-IN, Univ. do Porto )
      • 18:00
        Effects of the Pump Wavelength on Laser-Induced Ultrafast Demagnetization 2h

        A high harmonics source is used to probe the dynamics of laser-induced ultrafast demagnetization with respect to the wavelength of the pump beam. Longer pump wavelengths are found to increase the initial quenching levels.

        Speaker: Katherine Légaré (INRS-EMT)
      • 18:00
        ELI-ALPS SYLOS GHHG Beamlines: Optimizing Generation Conditions for High-power Laser Pulses 2h

        In this work we overview considerations aiming to optimize high harmonic generation (HHG) for the ever growing laser powers through the examples of two gas HHG beamlines of ELI-ALPS.

        Speaker: Balázs Nagyillés (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:00
        Ellipticity-Resolved High-Harmonic Spectroscopy of Phase-Locked Attosecond Pulse Trains 2h

        We develop and explore, theoretically and experimentally, a high harmonic spectroscopy technique for the interlocking of attosecond pulse trains (APTs). We produce a pair of intertwined APTs by driving HHG with cross-linear $\omega$-2$\omega$ fields and then modify their properties by introducing slight ellipticities to the drivers. Most importantly, we developed an analytic formula that maps very well the properties of the APT pair to the ellipticities of the high harmonics (which vary from linear to nearly circular). We utilize this mapping for recovering APTs properties (attosecond relative delay, relative polarization angle and APT ellipticities) by measuring the ellipticities of the high harmonics vs. the pump ellipticity.

        Speaker: Mr Eliyahu Bordo (Technion)
      • 18:00
        Enhancement and Spatial Manipulation of High Harmonics in Crystals 2h

        We report on the enhancement of high harmonics by field confinement in zinc oxide nanostructured cones and the generation of high harmonics carrying an orbital angular momentum using two different approaches.

        Speaker: Ms Shatha Kaassamani (CEA Saclay)
      • 18:00
        Enhancement of High Harmonics Emission in Trasmission by Surface Plasmon Polariton 2h

        Enhancement of high harmonics generation (HHG) in transmission by using spatial modulated targets is considered. We observed a dependence of HHG enhancement upon SPPs arose via the coupling of laser to grating in two-dimension simulations.

        Speaker: Chaoneng Wu (China Academy of Engineering Physics)
      • 18:00
        First Attosecond Pulses in ELI-ALPS High Repetition Rate Beamline 2h

        The detection of the first train of attosecond light pulses in the ELI-ALPS facility is reported in this work. Both the XUV spectrum and the temporal profile of the generated high harmonics are discussed.

        Speaker: Miklós Füle (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:00
        First Results on Single Ionization of Helium by Extreme Ultraviolet Photons at Lanzhou 2h

        The platform dedicated to studies of extreme ultraviolet (EUV) laser on atom/molecule has been established recently at the Institute of Modern Physics, CAS, Lanzhou. The platform consists of an EUV laser system and a reaction microscope. Testing experiment on single ionization of helium atom by EUV photon of about 37.5 eV was conducted. Photoelectron angular distributions are obtained and compared with theoretical calculations from TDSE method.

        Speakers: Prof. Shaofeng Zhang ( Institute of Modern Physics, Chinese Academy of Sciences), Prof. Xinwen Ma ( Institute of Modern Physics, Chinese Academy of Sciences)
      • 18:00
        Following Phonon Dynamics in Solids Using High-Harmonic Spectroscopy 2h

        Ultrahigh-order wave mixing is observed in quartz using non-collinear two-color interferometric measurements. Using this methodology, we can initiate, control, follow, and reconstruct phonon dynamics of quartz in real-time with high fidelity.

        Speaker: Tran Trung Luu (ETH Zürich)
      • 18:00
        Generation of Terahertz radiation Using Large Aperture Photoconductive Antennas and Subps KrF Lasers 2h

        During the first experimental campaign in 2017, we demonstrated the PCA principle using subps KrF lasers with high (5.1 eV) photon energies. In 2018 we continued the experiments with Large Aperture Photoconductice Antennas (LAPCAs), fabricated from the previously measured best candidates (4H-SiC and 6H-SiC).

        Speaker: Mr Zsolt Kovács (Wigner RCP)
      • 18:00
        H$_2^+$ Dissociation in Strong Laser Fields 2h

        By triggering the dissociation of H$_2^+$ with an isolated attosecond pulse, we manipulate the dissociation process using laser pulses with different wavelengths. The bond hardening and angle-resolved dissociation are observed.

        Speaker: Prof. Feng He (Shanghai Jiao Tong University)
      • 18:00
        HHG-Driven Photoionization of Noble Gaseous Atoms Investigated with Newly-Built Reaction Microscope in Lanzhou 2h

        Photoionization of noble gaseous atoms via HHG have been studied with the reaction microscope recently established in Lanzhou. Simultaneous excitation and photoionization of Ar is investigated where asymmetric parameters for the photoelectron angular distributions are obtained.

        Speakers: Prof. Shaofeng Zhang (Institute of Modern Physics, Chinese Academy of Sciences), Prof. Xinwen Ma (Institute of Modern Physics, Chinese Academy of Sciences)
      • 18:00
        High Efficient Carrier-Envelope Offset Frequency Measurement and Control with a Tapered Photonic Crystal Fiber 2h

        We present a tapered photonic crystal fiber using for octave spanning continuum generation. With an input of 300 pJ pulse, a robust and low noise fceo signal was measured to be 35 dB, which supports easy stabilization.

        Speaker: Huibo Wang (Institute of Physics, Chinese Academy of Sciences)
      • 18:00
        High Harmonic Generation and Applications at ELI Beamlines 2h

        We present currently installed user stations that exploit the secondary source of extreme ultraviolet (XUV) radiation produced via high harmonic generation (HHG) in gases at ELI Beamlines facility.

        Speaker: Dr Ondřej Hort (ELI Beamlines)
      • 18:00
        High Harmonic Generation Gas Cell for High Repetition Rate Secondary Sources 2h

        Results of the model calculation and first experiments are presented on custom designed gas cell prototypes for high order harmonic generation fit to the high repetition laser based secondary sources in ELI-ALPS.

        Speaker: Mr Zoltán Filus (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:00
        High Harmonic Generation in 2D and 3D Semiconductors 2h

        We present recent results on high harmonic generation in graphene and we study the dependence of the generation process on the band structure of 2D materials and bulk crystals through polarization spectroscopy.

        Speakers: Ms Shatha Kaassamani (CEA Saclay), Dr David Gauthier (CEA Saclay)
      • 18:00
        High Harmonic Generation on Noble Gas Clusters 2h

        The ellipticity dependence of HHG from noble gas clusters was measured for different cluster sizes. Results show that electrons recombine with the parent ion only and the charge does not become delocalized in the cluster.

        Speaker: Mr Balázs Bódi (MTA Wigner RCP)
      • 18:00
        High Intensity High-order Harmonic Generation by Optimizing Phase Matching Condition 2h

        High harmonic generation driven with 16 mJ /35 fs Ti:sapphire laser was studied. By optimizing the media length, gas pressure and the position of the gas cell, we obtained collimated XUV radiation at the same time with enhanced energy.

        Speaker: Ms Yueying Liang (Institute of Physics, Chinese Academy of Sciences)
      • 18:00
        High Order Harmonic Generation in an Active Grating 2h

        High order harmonic generation (HHG) driven by a combination of two or more femtosecond laser fields has lately been thoroughly investigated for its capability to impart specific properties to the outgoing XUV spectrum. Although HHG is a strong field process, the observations were mainly interpreted in terms of photon conservation. Here, we will present a complementary approach based on the analysis of the spatio-temporal structure of the composite driving field at focus. This "wave picture" predicts the same conservation laws as the "photon picture". However, it goes further as it also predicts correct yields and let envision new structuration schemes. These results are supported by theoretical calculations and experiments.

        Speaker: Thierry Ruchon (LIDYL / CEA-Saclay)
      • 18:00
        High Power 1 TW Ti:sapphire Laser at 1 kHz for High Energy High Harmonic Generation 2h

        We demonstrated 1 TW Ti:sapphire laser system at 1 kHz, which uses a cavity-mode-adjustable regenerative cavity as pre-amplifier for adjustable beam waist to match the beam mode in subsequent multi-pass amplifier. The compressed pulses with power of 25 mJ in 27.1 fs, which corresponds to 0.92 TW, were realized under the pump power of 108 W with cryogenically cooling. The result will pave a way to generation of high energy XUV attosecond source based on HHG at high repetition rate.

        Speaker: Prof. Hao Teng (Institute of Physics, Chinese Academy of Sciences)
      • 18:00
        High Repetition Rate Attosecond Pulse Source for Coincidence Spectroscopy 2h

        Attosecond coincidence spectroscopy is a powerful tool to study ultrafast phenomena in molecules. Here, we present an attosecond pulse source working between 50 and 100 kHz which we are currently developing for photoelectron/-ion coincidence spectroscopy.

        Speaker: Dominik Ertel (University of Freiburg)
      • 18:00
        High Resolution Mass Spectrometry and Velocity Map Imaging for Ultrafast Electron Dynamics in Biomolecules 2h

        We present a new design and characterization of a velocity-map-imaging electron spectrometer combined with a reflectron mass spectrometer. Together with attosecond and femtosecond pump-probe methods it will enable studies of ultrafast dynamics in large molecules.

        Speaker: Mr Krishna Chaitanya Saraswathula (Center for Free-Electron Laser Science (CFEL), DESY)
      • 18:00
        High-energy Ultrafast Mid-IR Optical Parametric Amplifier for Strong-Field Science 2h

        We present a high-energy mid-IR OPA tunable between 2.8 and 3.8 $\mu$m for strong-field applications. HHG driven by two-colour pulses was studied in atoms and molecules using this source.

        Speaker: Mr Prabhash Prasannan Geetha (IFN-CNR and Politecnico di Milano)
      • 18:00
        High-order Harmonic Generation in Graphene Under Local Ultrahigh Pressure 2h

        Here, we extend the study of high-order harmonic generation in graphene, simulating through DFT methods its electronic structure when the crystalline material is brought in extreme conditions, namely when is exposed to local ultrahigh pressure. By solving the time-dependent Schrödinger equation in the density matrix formalism, we have access to the current in the time-domain and a Fourier transform give us the high-harmonic spectrum coming from distorted bands.

        Speaker: Giovanni Consalvo Cistaro (Universidad Autónoma de Madrid)
      • 18:00
        High-order Harmonics as Induced by a Quantized Field: a Phase-space Picture 2h

        The interaction of matter with a quantized electromagnetic mode is considered. Using Neumann-lattice coherent states, we present a transparent phase-space picture describing the back-action of the material sample on the exciting mode.

        Speaker: Dr Péter Földi (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:00
        Influence of Vacancy-Defect in Solid High-Harmonic Generation 2h

        Our current work indicates that solids with vacancy-defect are potential band-gap materials for generation of high-energy radiation in XUV and soft x-ray energy regime. HHG from solids with vacancy-defect will be fascinating avenues for future work.

        Speaker: Mr Adhip Pattanayak (Indian Institute of Technology Bombay)
      • 18:00
        Interference Signatures from Kramers-Henneberger Atoms 2h

        Irradiating a strong laser field on a hydrogen atom forms a Kramers-Henneberger atom, whose photoelectron presents double-slit interference characters if it is exposed to another strong laser pulse.

        Speaker: Mr Pei-Lun He (Shanghai Jiao Tong University)
      • 18:00
        Isotope Effects on the Ionization of Hydrogen Molecular Ions in Strong Laser Fields 2h

        Isotope effects on the ionization of hydrogen molecular ions in strong laser fields are studied systematically for single-photon, multiphoton and tunneling ionization. We also propose a potential technique to image diatomic molecules.

        Speaker: Liang Xu (Shanghai Jiao Tong University)
      • 18:00
        Light Induced Ultrafast Thermal Processes in Metal: Thermal Evolution to Material Damage 2h

        Here we study the ultrafast electron and lattice thermal response of metal gold films when it is excited with an ultrashort focused laser field strong enough to drive the electronic and phonon population out of thermal equilibrium with each other .

        Speaker: Mousumi Upadhyay Kahaly (Group leader, senior researcher)
      • 18:00
        Measurement of Attosecond Electron Pulses Emitted from Metallic Nanotips 2h

        Here, we introduce Homodyne Attosecond Streaking (HAS) to characterize the temporal properties of the nonlinear photoemission from nanostructure materials. Our work opens new pathways for exploring the interaction of light and matter, the advancement of light-based electronics, and lays the groundwork for attosecond electron diffraction studies.

        Speaker: Mr Hee-Yong Kim (University of Rostock)
      • 18:00
        Multiple Ionization of Ar in Strong Elliptically Polarized Laser Fields 2h

        Three-dimensional momentum distributions of Ar$^{n+}$ (n=1,2,3,4) are measured. The longitudinal and lateral momenta reveal the multiple ionization dynamics as well as the interaction of the ionized electrons with parent ion in strong laser fields.

        Speakers: Ms Zhao Xinning (Jilin University), Luo Sizuo (Jilin University), Ding Dajun (Jilin University)
      • 18:00
        NewStock, a Time-dependent Close-coupling Program for Atomic Ionization 2h

        We present NewStock, a time-dependent program to compute the photoionization of polyelectronic atoms by arbitrary light pulses. The program expands the capabilities of the Stock B-spline close-coupling structure code to the time-dependent domain.

        Speaker: Dr Luca Argenti (University of Central Florida)
      • 18:00
        Nonlinear Fourier Transform Spectroscopy of Acetylene by Intense Attosecond Pulse Trains 2h

        We performed nonlinear Fourier-transform spectroscopic measurements of C$_2$H$_2$ using intense attosecond pulse trains and an interferometer with sub-100-as accuracy, and revealed that the C-C dissociation proceeds via the resonant transition of C$_2$H$_2^+$ at ~11 eV.

        Speaker: Mr Takuya Matsubara (RIKEN Center for Advanced Photonics)
      • 18:00
        Nonlinear Fourier Transform Spectroscopy of O$_2$ with Intense Attosecond Pulse Trains 2h

        We investigated the dissociative ionization of O$_2$ by pump-probe measurements using extreme-ultraviolet attosecond pulse trains, and revealed that an electron-nuclear wave packet composed of O$_2^+$($B^2 \Sigma_g^−$) and O$_2^+$($3^2 \Pi_u$) is created by the pump pulse train.

        Speaker: Dr Shinichi Fukahori (RIKEN Center for Advanced Photonics)
      • 18:00
        Nonperturbative Enhancement of Inelastic Photoemission Delay in Metals: Comparison with Correlated Insulators 2h

        Proposing a theoretical model enabling nonperturbative treatment of core-level photoemission of metallic systems, we could properly account for extrinsic plasmon losses and determine the corresponding photoemission delays. This is the first-time exploration of inelastic photoemission delays of higher order plasmon satellites beyond the lowest order and then gives a route to manipulate the photoemission delay especially in metallic nanostructures showing strong higher order plasmon sidebands. Finally, we compare the physics of photoemission delay in a metal with that of a correlated insulator CuCl$_2$. We indicate that the key difference between two systems should be in the extendedness of screening of the created hole. This finding guides to a new realm of attosecond electron dynamics of correlated electron systems.

        Speaker: Jaedong Lee (DGIST)
      • 18:00
        Nonsequential Double Ionization of Helium in IR+XUV Two-color Laser Fields 2h

        By using the frequency-domain theory, we investigate the nonsequential double ionization (NSDI) process of helium in IR+XUV two-color laser fields, where we found the two lasers play different roles in the NSDI processes.

        Speaker: Dr Bingbing Wang (Institute of Physics, Chinese Academy of Sciences)
      • 18:00
        Observation of Inter-Channel Coupling in Photoionization Delays of Carbon Dioxide 2h

        Photoionization delays are measured and calculated for CO$_2$. Comparison of theory to experiment shows that inter-channel coupling and electronic energy exchanges are present in the data. Time-domain observations of channel coupling effects are reported.

        Speaker: Mr Andrei Kamalov (Stanford PULSE Institute, SLAC National Accelerator Laboratory)
      • 18:00
        On the Theory of Attosecond Interferometry Experiments for Liquid Water 2h

        Based on the soft-photon approximation, a 3D Monte-Carlo trajectory method is developed to simulate attosecond interferences (RABBITT) experiments of liquid water. The method is presented and it is explained how it can help to understand the experimentally measured delays.

        Speaker: Hans Jakob Wörner (ETH Zürich)
      • 18:00
        Optical Lasing during Laser Filamentation in the Nitrogen Molecular Ion: Ro-vibrational Inversion 2h

        We propose a mechanism that explains the population inversion between the $B^2\Sigma^+_u$ state and the $X^2Σ^+_g$ state and is based on the combined effect of several processes.

        Speakers: Dr Felipe Morales (Max-Born-Institut), Dr Maria Richter (Max-Born-Institut)
      • 18:00
        Origin of Strong-Field Induced Low-Order Harmonic Generation in Amorphous Solids 2h

        We investigated the strong-field induced nonlinear optical response of solid dielectrics emerging from the sub-cycle injection dynamics of electrons into the conduction band by low-order wave mixing experiments and corresponding simulations.

        Speaker: Benjamin Liewehr (University of Rostock)
      • 18:00
        Phase Control of Complex Fano Resonances 2h

        In this contribution we investigate the effect, commonly known as interference stabilization, in the time-domain by employing an effective Hamiltonian, which describes a two-level system coupled to an arbitrary number of continua.

        Speaker: Mr Nicola Mayer (Max Born Institute)
      • 18:00
        Photodissociation Dynamics of the LiF Molecule 2h

        The photodissociation of LiF is usually described on the nonadiabatically coupled lowest two $\Sigma$ electronic states considering only the vibrational motion of the molecule. In the present work we highlight the importance of both the lowest $\Pi$ state and the molecular rotation.

        Speaker: Dr Attila Tóth (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:00
        Photoelectron Holography of Noble Gas Atoms 2h

        The interference of electronic wave packets created during ionization leaves a characteristic mark on the momentum distribution of the photoelectrons which is interpreted as the hologram of the target. We report our findings on the sensitivity of these holographic structures on the atomic species of the target.

        Speaker: Attila Tóth (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:00
        Photoionization Time Delay in Xenon 4d Probed by Coincidence Spectroscopy 2h

        We measure the variation of the photoemission time delay as a function of XUV photon energy in Xe 4d$_{5/2}$ and 4d$_{3/2}$ shells and investigate the post collision interaction between the photoelectrons and the Auger electrons.

        Speaker: Shiyang Zhong (Lund University)
      • 18:00
        Photon Gas in Plasma: Thermodynamics and Bose-Einstein Condensate 2h

        The thermodynamical properties of the photon-plasma system had been studied using statistical physics approach. It is demonstrated that the presence of the plasma medium enables the photon gas to undergo a Bose-Einstein condensation by adjusting the relevant parameters to criticality. Planck’s law of blackbody radiation is also modified with the appearance of a gap below the plasma frequency where a condensation peak of coherent radiation develops for the critical system.

        Speaker: Peter Mati (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:00
        Polarization-state-resolved High-harmonic Spectroscopy on Crystalline Solids 2h

        We investigate the polarization states of high-harmonics generated from different semiconductors. We find significant deviations from the driving pulses’ polarization and circularly polarized harmonics from elliptically polarized pulses.

        Speaker: Mr Nicolai Klemke (Center for Free-Electron Laser Science (CFEL), DESY)
      • 18:00
        Post-Compression of Pulses from an Yb Amplifier to 25 fs at 40 mJ 2h

        The combination of Yb amplifier with a stretched, hollow-core fiber, results in the generation and post-compression of laser pulses to reach 25 fs at the energy record of 40 mJ, corresponding to 1.6 TW peak power.

        Speaker: Paolo Carpeggiani (TU Wien)
      • 18:00
        Probing Molecular Influence on Photoemission Delays 2h

        Molecular photoemission delay includes contributions from electron birth process and its subsequent propagation within the molecular environment. Here attosecond streaking spectroscopy enabled disentangling these contributions facilitating to understand the influence of molecular environment on it.

        Speaker: Dr Shubhadeep Biswas (Ludwig Maximilians Universität)
      • 18:00
        Quantum Control and Multi-Dimensional Laser-Induced Mass Spectrometry of Biomolecules 2h

        We discuss how a new two-dimensional mass spectrometry can maximise the structural information derived from molecules fragmented using ultra-short laser pulses, and achieve closed-loop quantum control over the dissociation of specific bonds in biomolecules.

        Speaker: Ms Ruth Ayers (Imperial College London)
      • 18:00
        Quantum Path Interferences in High-Harmonics Generated by Impulsively Aligned N$_2$ Molecules 2h

        Based on a time-gated ion microscopy self-referenced technique, we report evidence of electron quantum path interferences in the harmonics generated by field-free aligned N$_2$ molecules and measure their phase dependence on molecular orientation.

        Speaker: Dr Ioannis Liontos (FORTH-IESL)
      • 18:00
        Radially Polarized Pulses Compression 2h

        We experimentally show the compression of a radially polarized vector beam to the few-cycle regime with the conventional method that we compress Gaussian beams, without distorting their radially polarized nature.

        Speaker: Chunmei Zhang (University of Ottawa)
      • 18:00
        Reconstruction of Tunneling Time and Exit Momentum in Strong Field Ionization, Based on Phase Space Methods 2h

        Based on phase space analysis of tunnel ionization, we propose a new method to retrieve the exit momentum and the time instant of the electrons’s emergence at the exit of the tunnel, from measured data.

        Speakers: Szabolcs Hack (ELI-ALPS, ELI-HU Non-Profit Ltd.), Attila Czirják (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:00
        Resonant Faraday Effect Using High Order Harmonics for the Investigation of Ultrafast Demagnetization 2h

        In this presentation, we will show how to easily probe magnetization dynamic with linearly polarized EUV or soft X-ray light with a versatility similar to XMCD by exploiting the Faraday effect.

        Speaker: Dr Guillaume Lambert (LOA)
      • 18:00
        Seemingly Anomalous Electronic Signature in oriented Chiral Molecules upon Ultrafast laser 2h

        In this work, we study the effect of linearly polarized electric fields on the dynamics of oriented chiral molecules. We aim at understanding the conditions required to break chirality by bringing enantiomers out-of-equilibrium.

        Speaker: Dr Gopal Dixit (Indian Institute of Technology Bombay)
      • 18:00
        Selection Rules in HHG: Unified Microscopic-macroscopic Group Theory and Observation of New Selection Rules 2h

        We formulate a general theory for selection rules in HHG that accounts for both microscopic and macroscopic symmetries of the light-matter interaction. We demonstrate experimentally selection rules of new symmetries, including elliptic and multi-scale.

        Speaker: Mr Gavriel Lerner (Technion)
      • 18:00
        Selective Electron Emission in XUV+IR Photoionization 2h

        In the present work we theoretically investigate several geometrical arrangements between the polarization vectors and the emission direction, that lead to selective sideband orders in the ionization spectrum.

        Speaker: Renata Della Picca (CONICET and Bariloche Atomic Center, CNEA)
      • 18:00
        Self-referenced Spatio-temporal Characterization of Few-cycle Pulses 2h

        In this work we review two techniques that are able to perform spatio-temporal pulse characterization of few-cycle pulses without the need for a separate reference pulse.

        Speaker: Dr Tobias Witting (Max Born Institute)
      • 18:00
        Simultaneous, Long-term Stabilization of the Delay and CEP for Coherent Combination of the Two-color Few-cycle Pulses 2h

        We present an f-to-2f interferometry method to simultaneously measure and control the delay and carrier-envelope phase (CEP) of a near single-cycle waveforms. Long-term stabilization of the phase-locking system results in a CEP stability of 280 mrad and a delay stability of 28 attosecond over 8 hours at 1 kHz repetition rate.

        Speaker: Prof. Shaobo Fang (Institute of Physics, Chinese Academy of Sciences)
      • 18:00
        Single-Image Measurement of an Isolated Attosecond Pulse 2h

        We demonstrate single-image measurement of an isolated attosecond pulse. By imaging X-rays on a detector, the amplitude and phase of the attosecond pulse are measured from a single image, showing a duration of 190 as.

        Speaker: Dr Donghyuk Ko (University of Ottawa)
      • 18:00
        Spatio-temporal Characterization of a High Repetition Rate, Few-cycle, CEP-stable OPCPA Laser 2h

        We characterize and minimize spatio-temporal distortions originating from noncollinear optical parametric amplification in an OPCPA laser source with the help of the dispersion-scan technique and 3D Fourier transform spectrometry.

        Speaker: Dr Chen Guo (Lund University)
      • 18:00
        Spatio-Temporal Dynamics in Femtosecond Filamentation 2h

        We present an experimental scheme capable of revealing complete spatio-temporal dynamics of a femtosecond filament. Our findings may help exploit the full potential of filamentation for supercontinuum generation.

        Speaker: Mrs Lana Neoricic (Lund University)
      • 18:00
        Spatiotemporal Coupling of Attosecond Pulses 2h

        The spatial influence of the intensity-dependent dipole phase is incorporated into a Gaussian optics model in order to study chromatic aberration of broadband XUV attosecond pulses. This effect may lead to spatiotemporal coupling when refocusing the beam.

        Speakers: Mr Hampus Wikmark (Lund University), Prof. Mette B. Gaarde (Louisiana State University)
      • 18:00
        Spectral Variation of the Driver after HHG in Long Medium: Correlation to Conversion Efficiency and Harmonic Spectral Shift 2h

        We present a study of dependencies of the HHG conversion efficiency and the spectral shift of the harmonics on the driving laser intensity in a loose focusing configuration and long generation medium.

        Speaker: Dr Jaroslav Nejdl (ELI Beamlines)
      • 18:00
        Strong-field Dynamics Driven by Ultrafast Hyper-Gaussian Pulses in Cascade Three-level System 2h

        Strong field dynamics of ultrashort laser pulses with hyper-Gaussian temporal profiles in cascade three-level system under two-photon resonant condition is studied here.

        Speaker: Dr Ji-Cai Liu (North China Electric Power University)
      • 18:00
        Strong-field-induced Electron and Nuclear Dynamics in Nitric Oxide Probed by Attosecond Soft X-ray Absorption Spectroscopy 2h

        We report on time-resolved soft X-ray absorption spectroscopy of nitric oxide at the nitrogen K-edge (400 eV). Dynamics of electron and nucleus under strong electric field has been observed with electronic-state specificity.

        Speaker: Mr Nariyuki Saito (The University of Tokyo)
      • 18:00
        Study on XUV Photon Flux Contributed by Phase-matched Off-axis High-order Harmonic Generation (HHG) 2h

        On-axis and off-axis components dominates XUV radiation near cut-off frequency and within the plateau respectively. Hence, phase-matching condition need to be evaluated along both axial and lateral direction to obtain global optimal HHG flux.

        Speaker: Dr Lifeng Wang (Singapore Institute of Manufacturing Technology, Singapore)
      • 18:00
        Sub-cycle Control Electron Localization of H$_2$ in Multicycle Laser Fields 2h

        Sub-cycle electron localization from interference of $1s\sigma_g$ and $2p\sigma_u$ states of H$_2$ in a multicycle laser pulse is tracked, which can be assigned to the dynamics correlation between ionization and dissociation process.

        Speaker: Dr Sizuo Luo (Jilin University)
      • 18:00
        Sub-cycle Electron Dynamics in the Generation of Below Threshold Harmonics 2h

        The generation of the below threshold harmonics (BTHs) under different driving laser intensities is investigated. The linearly shifting of photon energy and resonantly enhancement of photon yield of the harmonics from 23rd (H23) to 27th (H27) are found by changing the laser intensity around 18.6 TW/cm$^{2}$.

        Speaker: Prof. Zhinan Zeng (Shanghai Institute of Optics and Fine Mechanics)
      • 18:00
        Subcycle Transfer of Linear Momentum in Nondipole Tunnel Ionization 2h

        We study the subcycle transfer of photon momentum in tunnel ionization beyond the dipole approximation using the attoclock setup. We separate the momentum transfer during tunneling and propagation in continuum using the backpropagation method.

        Speaker: Hongcheng Ni (Vienna University of Technology)
      • 18:00
        Surface High Harmonics Using a Long Focusing Length 2h

        Here we present recent results on Surface High-order Harmonic Generation (SHHG) by using the Jeti200 laser system using long focal length f/12 system, with a peak intensity of >10$^{19}$ W/cm$^{2}$ (<3J, 25fs, single plasma mirror). The experiment examines the ROM harmonic emission efficiency in a multi parametric scan of pulse duration (GVD), laser energy and spatial intensity distribution.

        Speakers: Mr Mingyuan Shi (Helmholtz institute Jena), Mr Ross McHugh (Helmholtz institute Jena)
      • 18:00
        Tailoring Caustics in High-harmonic Generation with Phase-controlled Multi-colour Fields 2h

        Strong modulation in the spectral density of neon’s high harmonic spectra are experimentally observed, being driven by strongly shaped two-colour laser fields. They reveal intricate interference features that are not observed in the existing literature.

        Speaker: Mr Sambit Mitra (Max Planck Institute of Quantum Optics)
      • 18:00
        The Influence of Many-Electron Atoms Polarization in a Strong Laser Field on the High-Order Harmonic Generation 2h

        It is shown that polarization of many-electron atoms in an intense laser pulse may lead a screening of the laser field, which results the suppression of atom depletion and thereby enhances the high-order harmonic generation yield.

        Speaker: Dr Nikolai V. Vvedenskii (Institute of Applied Physics, Russian Academy of Sciences)
      • 18:00
        Time Resolved Photoelectron Circular Dichroism of Fenchone at FERMI 2h

        We demonstrated that femtosecond chiral dynamics in fenchone can be probed using core level spectroscopy with circularly polarized XUV light provided by the free-electron laser FERMI.

        Speaker: Davide Faccialà (CNR-IFN)
      • 18:00
        Time-resolved Soft X-Ray Transient Absorption in the Liquid Phase 2h

        Here, we report the development of a table-top transient absorption setup, based on high-harmonic generation to generate broadband continua covering the water window (284-538 eV).

        Speaker: Dr Adam Smith (ETH Zürich )
      • 18:00
        Towards a mW-scale Attosecond Source 2h

        Intra-cavity based harmonic sources have enabled the generation of extreme ultraviolet frequency combs and are attracting increasing attention as attosecond sources. We here discuss recent advances and our efforts towards a high power attosecond source.

        Speaker: Dr Christoph M. Heyl (DESY / HI Jena)
      • 18:00
        Towards Intense Isolated Attosecond Pulses by Waveform Synthesis 2h

        A waveform-synthesized field obtained by frequency mixing of a Ti:S laser with a 1257-nm OPA is used to drive high harmonic generation. The measured and simulated spectra as a function of delay show similar features.

        Speaker: Alice Autuori (LIDYL, CEA Saclay)
      • 18:00
        Transient Optical Gain in Solids after Strong-field Excitation 2h

        In some solids, ultrafast nonlinear excitation of valence electrons to conduction bands creates population inversion and, with it, optical gain at frequencies within the transparency region of the unperturbed solid.

        Speaker: Mr Muhammad Qasim (Max Planck Institute of Quantum Optics)
      • 18:00
        Two-Color High-Harmonic Spectroscopy of Liquids 2h

        We demonstrate two-color interferometric measurements of high-order harmonic generation (HHG) of liquids. The relative phase of the modulations of odd and even harmonics is independent of the intensity, but shows a strong photon-energy dependence above the bandgap.

        Speaker: Dr Tran Trung Luu (ETH Zürich)
      • 18:00
        Ultrafast Background-Free Detection of Ring Currents by Symmetry Breaking High Harmonic Spectroscopy 2h

        We propose and theoretically explore an all-optical technique for detecting atomic, molecular, or solid ring-currents based on high harmonic generation, where ring current-carrying media emit elliptically polarized high harmonics, whereas current-free media emit strictly linearly polarized harmonics.

        Speaker: Mr Ofer Neufeld (Technion)
      • 18:00
        Ultrafast Dissociation of OCS Influenced by Neighbor Ion $OCS^{(1,2)+}$ in a Dimer 2h

        We have experimentally studied the three-body dissociation dynamics of (OCS)$_{2}^{(3,4)+}$ based on the coincidence measurement. Two indirect and one direct channels are resolved and the influences of neighbor ions in the dimer have been discussed.

        Speaker: Mr Xitao Yu (Jilin University)
      • 18:00
        Ultrafast Electron Dynamics and High Harmonic Generations in Novel Two-dimensional Materials 2h

        Taking into account electronic band structure of multilayer graphene, and using a semi-classical approach, we address the mechanisms of high harmonic generation in graphene, and identify strong contributions towards HHG.

        Speaker: Dr Mousumi Upadhyay Kahaly (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:00
        Ultrafast Electron Dynamics in Relativistic Intensity Laser Plasma Interaction Revealed by Coherent THz Transition Radiation 2h

        Ultrafast electron emission dynamics in the interaction of relativistic intensity laser pulses with solid density plasma have been investigated by analyzing temporal profile of the emitted THz field which are recorded in single-shot electro-optic measurement.

        Speaker: Sudipta Mondal (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:00
        Ultrafast Electronic Decay through Carbon Chains 2h

        The electronic decay of O2s vacancy in fluorinated cumulenones has been investigated using ab initio methods. In all studied cases this state decays non-locally by emitting an electron from the remote fluorines.

        Speaker: Dr Alexander Kuleff (Heidelberg University)
      • 18:00
        Ultrafast Intramolecular Electron Transfer in Dye-sensitized Solar Cells: A Computational Perspective 2h

        Electron transfer between the organic dye to semiconducting substrate in Dye Sensitized Solar Cells (DSSC) plays a crucial role in determining the efficiency of the solar cells. We discuss how the photoexcited charge transfers in such molecules and the overall photoabsorption can be further tuned under suitable laser field.

        Speaker: Ms Kalyani Chordiya (ELI-ALPS, ELI-HU Non-Profit Ltd.)
      • 18:00
        Universal Pulse Characterization Method for a Multi-octave Wavelength Range from UV to IR 2h

        A universal pulse characterization method that can be applied for a multi-octave wavelength range from UV to IR without having a duration limit is presented. The validity of the method is verified theoretically and experimentally.

        Speaker: Mr Wosik Cho (Institute for Basic Science / Gwangju Institute of Science and Technology)
      • 18:00
        XUV and Soft X-ray Transient Absorption Spectroscopy of Strong-Field Excited Molecules 2h

        XUV transient absorption spectroscopy has been performed on small gaseous molecules with few femtosecond time resolutions using a strong field IR/VIS pump and high harmonic probe. Rydberg/cationic excited state nuclear dynamics have been observed.

        Speaker: Mr Danylo Matselyukh (ETH Zürich)
    • 08:30 10:15
      High-harmonic spectroscopy and generation in solid materials: #3
      • 08:30
        Solid State Harmonics: Spatiotemporal Properties and Connection to Band Structure 30m

        This talk will discuss how the laser-driven electron dynamics on the band structure are imprinted on the temporal, spectral, and spatial properties of solid-state harmonics.

        Speaker: Prof. Mette B. Gaarde (Louisiana State University)
      • 09:00
        Light-Wave Magnetization Dynamics 15m

        We experimentally demonstrate direct optical control and switching of magnetization in solids with unprecedented sub-femtosecond time resolution. The reported results open the doors to a new generation of Petahertz spintronic devices.

        Speaker: Mr Florian Siegrist (MPI of Quantum Optics)
      • 09:15
        Tracking the Phase Transition in VO$_2$ using High Harmonic Spectroscopy 15m

        We investigate the dynamics of the insulator-to-metal phase transition in VO$_2$ with high temporal resolution using a new method of time-resolved high harmonic spectroscopy in a solid-state system, revealing all electronic states involved.

        Speaker: Elissa Haddad (INRS-EMT)
      • 09:30
        Reconstruction of Valence Electron Density in Solids using Optical Laser Fields 15m

        In this work, we show that the high harmonic generation in solids in the presence of intense optical laser fields allows us to visualize valence electrons with a sub-Angstrom resolution for the first time.

        Speaker: Harshit Lakhotia (University of Rostock)
      • 09:45
        Multi-Band Petahertz Currents Resolved via High Harmonic Generation Spectroscopy 15m

        In our study we reveal the underlying attosecond dynamics that dictates the temporal evolution of carriers in multi-band solid state systems, via high harmonic generation (HHG) spectroscopy.

        Speaker: Ayelet Uzan (Weizmann Institute of Science)
      • 10:00
        Ultrafast Spin Dynamics and High Harmonic Generation in 2D Systems 15m

        In this talk, we present our research on high-harmonic generation in systems with strong spin-orbit coupling such as multilayer systems based on graphene and transition metal dichalcogenides.

        Speaker: Dominik Schulze (Martin-Luther-Universität Halle-Wittenberg)
    • 10:15 10:45
      Coffee 30m
    • 10:45 12:30
      Photoelectron-based probing of atomic and molecular states: #15
      • 10:45
        Simulating Strong Field Rescattering Using Attosecond Light 30m

        An atom or molecule interacting with an intense, ultrafast laser pulse is a fundamental problem in modern physics. At intensities that are approximately one-tenth an atomic unit of field (50 V/A) the physics is well described by a semi-classical 3-step model where an electron tunnel ionizes, driven by the strong-field and then rescatters with its parent core. The consequence of this physics has opened the areas of attosecond science and spatial-temporal molecular imaging. However in a strong field experiment, the exponential rate of tunnel ionization fixes the release phase of the electron wave packet (EWP) at the extreme of the laser field. In this talk, we will describe a method that allows for more precise studies of the strong field process. The approach simulates the 3-step model by replacing the tunneling step with single-photon ionization by an attosecond XUV pulse. A phase-locked intense low-frequency field drives the EWP mimicking steps (2) and (3) but with little or no ionization. We will present both experimental and theoretical results demonstrating the viability of this approach.

        Speaker: Louis DiMauro (The Ohio State University)
      • 11:15
        Controlled Asymmetric Photoelectron Emission Using Electron Wavepacket Interference 15m

        We demonstrate control of photoelectron emission in two-color photoionization through electron wavepacket interference, using attosecond pulse trains with either two or three pulses together with a few-cycle IR dressing field at a fixed delay.

        Speaker: Sara Mikaelsson (Lund University)
      • 11:30
        Electronic Wavefunctions Probed by All-Optical Attosecond Interferometry 15m

        We directly measure electron-ion scattering phase shifts in atomic systems using optical interferometry in the extreme ultraviolet domain. Our method reveals partial-wave scattering phase shifts and structural phase jumps, enabling studies of multielectron phenomena.

        Speaker: Dr Michael Krüger (Weizmann Institute of Science)
      • 11:45
        Time-resolved Orbital Imaging by Photoelectrons 15m

        We demonstrate imaging of bound electron wave packets following ionization. Using a pump-probe-deflect scheme, a superposition of spin-orbit states is prepared in Ar$^+$ and a movie of the wave packet evolution is recorded.

        Speaker: Matthias Kübel (Friedrich Schiller University Jena)
      • 12:00
        Real-time Probing of the Plasmonic Response of C$_{60}$ 15m

        The time-dependent plasmonic response of C$_{60}$ is revealed through attosecond streaking spectroscopy. The streaking delay as a function of the electron energy shows a decaying trend including zero-crossing, as a signature of photo-induced collective excitation.

        Speaker: Andrea Trabattoni (Center for Free-Electron Laser Science (CFEL), DESY)
      • 12:15
        Attosecond Quantum State Reconstruction of Autoionizing Electron Wavepackets 15m

        We reconstruct the temporal evolution of the density matrix of an autoionizing electron wavepacket using attosecond quantum state reconstruction with high spectral and temporal resolution.

        Speaker: Mr Hugo Laurell (Lund University)
    • 12:30 14:00
      Lunch 1h 30m
    • 14:00 15:45
      Harmonics from solid surfaces and new approaches: #5
      • 14:00
        Spatio-temporal Characterization of Attosecond Pulses from Plasma Mirrors by Ultrafast Photonic Streaking 30m

        The non-collinear superposition of a laser beam with a weak second harmonic beam produces laser wavefronts that oscillate angularly in time, at the laser frequency. We have used the resulting ultrafast (attosecond) photonic streaking to characterize, both in space and time, the attosecond pulses produced from plasma mirrors at intensities up to $10^{19}$ W/cm$^2$.

        Speaker: Dr Fabien Quéré (LIDYL, CEA, CNRS, Université Paris-Saclay)
      • 14:30
        Angular Streaking of Attosecond Pulse Trains from Relativistically Oscillating Mirrors 15m

        First experimental results on the angular streaking of attosecond pulse trains from relativistically oscillating mirrors are presented leading to the mapping of the temporal structure of the attosecond pulse train into emission angle.

        Speaker: Christian Roedel (Helmholtz Institute Jena)
      • 14:45
        XUV Spectral Interferometry and Generation of Isolated Attosecond Pulses from Relativistic Plasma Mirrors 15m

        We present laser waveform-dependent extreme ultraviolet high-order harmonic radiation from a relativistic plasma mirror that supports a well-isolated attosecond pulse. Spectral interferometry reveals information about its temporal structure and the relativistic generation mechanism.

        Speaker: László Veisz (Umea University)
      • 15:00
        Sub-cycle Control of High-harmonic and Electron Emission from Relativistic Plasma Mirrors 15m

        We present experiments using a relativistic-intensity 2-colour multi-cycle and 1.3-cycle laser fields to drive high-harmonic generation (HHG) from surface plasmas with controlled electron density gradient. Both examples demonstrate attosecond control over the underlying collective electron dynamics.

        Speaker: Dr Stefan Haessler (Laboratoire d'Optique Appliquée, Institut Polytechnique de Paris (ENSTA, Ecole Polytechnique, CNRS))
      • 15:15
        Harmonic Concatenation of 1.5-femtosecond-pulses in the Deep UV 15m

        A method for the synthesis of ultrashort pulses in the deep UV is demonstrated, which utilizes the temporal and spatial harmonics that are generated by two noncollinear IR-VIS pulses in a thin MgF$_{2}$ plate.

        Speaker: Dr Adrian Pfeiffer (Friedrich Schiller University)
      • 15:30
        Spatiotemporally Coupled Cavity-Enhanced High-Harmonic Generation 15m

        We demonstrate the first cavity-enhanced high-harmonic generation with spatiotemporal coupling, offering the prospects of gating isolated attosecond pulses at multi-10-MHz repetition rates and a highly efficient, photon-energy- and power-scalable output coupling mechanism.

        Speaker: Maximilian Högner (Max-Planck-Institut für Quantenoptik)
    • 15:45 16:15
      Coffee 30m
    • 16:15 18:00
      New approaches for measuring atomic and molecular dynamics: #16
      • 16:15
        Attosecond Photoionization Dynamics in Pathological Cases 30m

        I will review our recent studies on attosecond photoionization dynamics in complex cases where, e.g., multiple resonances are simultaneously excited, spin-orbit components overlap, Cooper minima are transferred by intershell correlation, or decoherence comes into play.

        Speaker: Pascal Salieres (CEA, CNRS, Université Paris-Saclay)
      • 16:45
        Imaging The Renner-Teller Effect Using Laser-Induced Electron Diffraction 15m

        We employ laser-induced electron diffraction (LIED) coupled with state-of-the-art quantum dynamical calculations to reveal a linear-to-bent transition that is enabled by the Renner-Teller effect in field-dressed molecules investigated with a single-pulse pump-probe excitation and measurement.

        Speaker: Dr Kasra Amini (ICFO)
      • 17:00
        Sub-femtosecond Timing Tool for Experiments with a Seeded Free Electron Laser 15m

        We present a novel approach to determine the relative delay jitter between a train of attosecond pulses and an infrared field with sub-femtosecond resolution, enabling pump-probe experiments on the attosecond timescale using seeded free electron lasers.

        Speaker: Praveen Kumar Maroju (University of Freiburg)
      • 17:15
        Opto-Optical Modulation (OOM) to Probe Stark Induced Phase Changes 15m

        Imparting control over extreme ultraviolet frequency light is challenging. Opto-optical modulation provides a means to both spatio-temporally control these frequencies, and probe Stark-induced phase changes, driving towards experimentally measured reconstruction of unknown nonlinear Stark-shifts.

        Speaker: Dr Emma R. Simpson (Lund University)
      • 17:30
        Mapping a Molecular Shape Resonance During a Molecular Transformation 15m

        We investigate the strong field ionization of photoexcited I$_2$ molecules by 1.3 $\mu$m laser pulses. When the molecule is stretched, we observe a large modification of the laser-assisted electron scattering cross-section that we assign to the evolution of a molecular shape resonance.

        Speaker: Dr Arnaud Rouzée (Max-Born-Institut)
      • 17:45
        Nature and Coherence of the Molecular-ion Electronic State Prepared by Attosecond Ionization 15m

        Here we elucidate the nature of the initial state for the hole-migration dynamics following ultra-fast ionization in the molecular ion, by quantitatively predicting its electronic coherence and eigenstates content.

        Speaker: Dr Marco Ruberti (Imperial College London)
    • 08:30 10:00
      Novel diagnostics and control of high-order harmonics: #6 Hotel Forrás

      Hotel Forrás

      H-6726 Szeged, Szent-Györgyi A. u. 16-24.
      • 08:30
        Generation of Structured EUV High-Harmonic Beams and Attosecond Pulses 30m

        Recent advances in nonlinear optics have enabled the generation of structured attosecond pulses with controllable angular momentum properties, including extreme-ultraviolet beams with spin and orbital angular momentum, and high-harmonics with selftorque --- time-dependent orbital angular momentum.

        Speaker: Dr Carlos Hernández-García (University of Salamanca)
      • 09:00
        Single-Shot Wavefront Measurements of High-Order Harmonics 15m

        We use a Hartmann wavefront sensor to measure single-shot wavefronts of high-order harmonics to study how they vary with generation parameters. We then use a new type of sensor with spectral resolution.

        Speaker: Hugo Dacasa Pereira (Lund University)
      • 09:15
        Mirrorless Focusing of High Order Harmonics by XUV Wavefront Control 15m

        By studying the spatial profiles of high-order harmonics generated in a gas jet, we show how harmonic beam profiles can be controlled and demonstrate that harmonics can be generated as converging beams thereby focused without XUV optics

        Speaker: Dr Eric Constant (ILM CNRS Univ Lyon 1)
      • 09:30
        Focusing and Spectral Filtering of XUV Harmonics without Optics 15m

        By controlling the intensity profile and wavefront of XUV high-order harmonics generated in a gas jet, we establish the possibility of focusing harmonic beams to micrometer spot size and achieve efficient spectral filtering without resorting to any XUV optics.

        Speaker: Kévin Veyrinas (CELIA CNRS Univ Bordeaux CEA)
      • 09:45
        Interferometric Attosecond Lock-in Measurement of Extreme Ultraviolet Circular Dichroism 15m

        We establish an extreme ultraviolet lock-in detection scheme, allowing the isolation and amplification of weak chiral signals, by achieving a direct time-domain polarization control. We demonstrate it by a phase-resolved measurement of magnetic circular dichroism.

        Speaker: Mr Omer Kneller (Weizmann Institute of Science)
    • 10:00 10:45
      Coffee 45m Hotel Forrás

      Hotel Forrás

      H-6726 Szeged, Szent-Györgyi A. u. 16-24.
    • 10:45 12:30
      Mapping of ultrafast quantum dynamics in solids and liquids: #9 Hotel Forrás

      Hotel Forrás

      H-6726 Szeged, Szent-Györgyi A. u. 16-24.
      • 10:45
        Photon Momentum, Spin and Magnetic Quantum Number in Tunnelionization 30m

        We will show that spin and magnetic quantum number influence tunneling and will discuss new results on non-dipole effects.

        Speaker: Prof. Reinhard Dörner (Goethe University)
      • 11:15
        Ultrafast Redistribution Snapshots of Nonequilibrium Photoexcited Carrier in Graphite Probed by sub-5-fs High-harmonic-based Time-resolved ARPES 15m

        We have revealed the ultrafast evolution of energy redistribution process from nonequilibrium carrier population formation to broad thermalized carrier distribution in photoexcited graphite by time-resolved and angle-resolved photoemission spectroscopy based on sub-5-fs high-order harmonic source.

        Speaker: Dr Katsuya Oguri (NTT Basic Research Laboratories, NTT Corporation)
      • 11:30
        Towards Attosecond Photoemission Electron Microscopy: Ultrafast Dynamics on Gold Nanosponges 15m

        We investigate the ultrafast dynamics on single gold nanosponges by imaging the random and long-lived localization of surface plasmons using time-resolved photoemission electron microscopy. The steps towards attosecond time resolution are discussed.

        Speaker: Jan Vogelsang (Lund University)
      • 11:45
        Experimental Signature of Intermolecular Coulombic Decay in Liquid Water 15m

        Experimental signature of the Intermolecular Coulombic Decay process in liquid water has been measured at separately at ELI-ALPS and ETH Zürich via coincidence photoelectron spectroscopy using a magnetic bottle time of flight spectrometer.

        Speaker: Mr Conaill Perry (ETH Zürich)
      • 12:00
        Spectral Caustic in Two-color HHG for Quasi-monochromatic XUV Source: Role of Coulomb Effects 15m

        We study the generation enhancement due to the spectral caustic in two-color HHG and show that the caustic feature can be used to provide a quasi-monochromatic XUV source with an almost linear frequency vs. time dependence.

        Speaker: Vasily Strelkov (Prokhorov General Physics Institute of the Russian Academy of Sciences)
      • 12:15
        Ultrafast Mapping of Coherenct Dynamics and Density Matrix Reconstruction in Terahertz-Assisted Laser Field 15m

        Using a phase-locked combination of XUV and terahertz fields to probe the dynamics of the system, we propose that the time-evolved density matrix can be reconstructed from photoelectronic spectra with the ultrafast coherent processes resolvable.

        Speaker: Dr Tian-Min Yan (Shanghai Advanced Research Institute, Chinese Academy of Sciences)
    • 12:30 16:30
      ELI-ALPS site visit and lunch 4h ELI-ALPS


      H-6728 Szeged, Wolfgang Sandner utca 3.
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