The Sylos GHHG Compact beamline is driven by the 1 kHz, two-cycle, TW class Sylos laser delivering up to 35 mJ IR output energy. As a consequence, the beamline is able to generate XUV pulses in the µJ energy range or mW average power (at generation). It is expected that these values will still improve as performance is optimized. The XUV pulses are currently delivered in a train of attosecond pulses estimated to have a duration of a few fs. Different generation gasses can be utilized to cover a photon energy range of 16 – 150 eV. The beamline includes a bipolar electron/ion ToF with a back-focusing split-and-delay option for XUV-XUV pump-probe experiments in the “diagnostic arm”.
Furthermore, an ion microscope (IM) combined with a grazing incidence focusing optic is available. Pulsed gas jet targets are provided for both instruments. A mirrored “user arm” accepts a custom user end station. Optionally (or alternatively), the “direct arm” can be used to avoid spectral constraints and to increase the XUV pulse energy at an end-station target.
The beamline can also be driven by the 10 Hz Sylos Alignment laser at reduced the average power. An XUV-IR pump-probe option is available but it is limited to delays of a few fs for diagnostic purposes.
Figure 1. Schematic optical layout of the Sylos GHHG Compact beamline.
Table 1 shows the measured specifications of the Sylos 2A laser system and the XUV radiation generated using GHHG in the Compact beamline. The full characterization and optimization of the XUV radiation is still in progress.
Table 1. Measured parameters of the Sylos 2A laser system and the XUV radiation generated thorugh HHG.
Representative data of the achievable XUV spectrum and flux are shown in Figure 2. The XUV pulse energy contained within harmonic orders 15 to 17 for Xenon (shaded area) is about 300 nJ at generation, which can be extrapolated to about 1 µJ for the entire spectrum. The photon energy of the spectrum is centred around 30 eV. By using Neon as the generating medium, a cutoff of 150 eV can be reached.
Figure 2. Measured XUV photon spectra for Xenon (left) and Neon (right).