The SYLOS 2A laser provides 4.5 TW peak power pulses with 6.8 fs duration at 1 KHz repetition rate. The laser system based on a sequence of NOPCPA stages consisting BBO and LBO amplifier crystals (produced by Light Conversion Ltd.), pumped by diode-pumped Nd:YAG lasers (EKSPLA Ltd). Fig. 1. shows the schematic layout, while more details can be found in [1, 2].
Fig.1. Schematic layout of SYLOS 2A
The most important output parameters are shown in Table 1. The energy can be varied continuously from 25 mJ to 37 mJ while other output parameters are kept constant. The energy can be reduced below 25 mJ as well, but all other laser parameters are not guaranteed. The CEP setpoint can be adjusted continuously between 0 and 2π. The pulse duration can be stretched up to 200 fs by adding negative chirp or alternatively by limiting the spectrum at the expense of pulse energy. All other parameters, including repetition rate and beam profile are not variable at the laser output.
Table 1. Measured parameters at the output of the SYLOS2A laser system.
Fig.2 shows a typical pulse shape reconstructed from a D-scan trace, the spectrum and the beam profile at the output of SYLOS 2A. The typical spectrum ranges from 730 nm to 1160 nm, with minor day-to-day variations, while the pulse duration is kept shorter than 6.8 fs. The beam profile is 60 mm in diameter, top-hat shape, best regressed with a 14th order super-Gaussian. Figure 3 demonstrates the typical stability of key output parameters during an eight-hour operation.
Fig.2. Typical reconstructed pulse shape (a) spectrum (b) and near field beam profile (c)
Fig.3 Typical long-term data of optical cycles, pulse energy, peak power, central wavelength, Strehl-ratio and CEP stability from top to bottom, respectively.
 R. Budriūnas, T. Stanislauskas, J. Adamonis, A. Aleknavičius, G. Veitas, D. Gadonas, S. Balickas, A. Michailovas, A. Varanavičius: 53 W average power CEP-stabilized OPCPA system delivering 5.5 TW few cycle pulses at 1 kHz repetition rate OE 25 (2017) 5797.
 Sz. Tóth, T. Stanislauskas, I. Balčiūnas, R. Budriūnas, G. Veitas, D. Gadonas, J. Csontos, A. Börzsönyi, K. Osvay: Numerical investigation of broadband NOPCPA schemes for sub-6.5 fs, 5.6 TW, 1kHz pulses of the ELI-ALPS SYLOS laser system, SPIE Optics + Optoelectronics Conference (2019) 11034-27