60 fs, 1030 nm FEL pump–probe laser based on a multi-pass post-compressed Yb:YAG source

Journal of synchrotron radiation 28(1), - (2021). doi:10.1107/S1600577520015052
This paper reports on nonlinear spectral broadening of 1.1 ps pulses in a gas-filled multi-pass cell to generate sub-100 fs optical pulses at 1030 nm and 515 nm at pulse energies of 0.8 mJ and 225 µJ, respectively, for pump–probe experiments at the free-electron laser FLASH. Combining a 100 kHz Yb:YAG laser with 180 W in-burst average power and a post-compression platform enables reaching simultaneously high average powers and short pulse durations for high-repetition-rate FEL pump–probe experiments.
Published by Wiley-Blackwell, [S.l.]