We present a novel, robust and efficient scheme for nonlinear pulse compression at highest average powers, which is based on self-phase modulation in a bulk nonlinear medium placed inside a multi-pass-cell (MPC). The scheme is suitable for the compression of sub-ps pulses with peak powers exceeding the threshold for catastrophic self-focusing of the nonlinear medium. Experimentally, we compress the output pulses from an Yb:YAG-Innoslab amplifier from 850 fs to <170 fs at 375 W of output power, 37.5 μJ pulse energy and almost diffraction-limited beam quality using fused silica as the nonlinear medium. The efficiency of the compression unit exceeds 90%.
Jan Schulte, Thomas Sartorius, Johannes Weitenberg, Andreas Vernaleken, and Peter Russbueldt, "375-W 37.5-µJ less than 170 fs laser system utilizing nonlinear pulse compression in fused silica," Proc. SPIE 10082, Solid State Lasers XXVI: Technology and Devices, 1008217 (Presented at SPIE LASE: February 01, 2017; Published: 17 February 2017); https://doi.org/10.1117/12.2250920.
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