22-W average power high pulse energy multipass-cell-based post-compression in the green spectral range

A gas-filled multipass-cell-based post-compression of 515 nm wavelength second-harmonic pulses of an Yb:fiber laser from 240 fs to 15.7 fs is presented. The system delivers 0.44 mJ of pulse energy, 22.4 W of average power at 50.8 kHz with an overall efficiency of more than 40%. These results display the capabilities of multipass-cell-based post -compression schemes to move from the well-established near infrared spectral region to the undeveloped visible regime, allowing for high efficiencies in conjunction with energetic ultrashort pulses at high repetition rates. The unique com-bination of parameters in the green spectral range offers an immense potential for future developments of high photon flux higher-order harmonic sources.(c) 2023 Optica Publish-ing Group https://doi.org/10.1364/OL.482600

Automated summary

This study presents the use of a gas-filled multipass cell to compress 515 nm wavelength second-harmonic pulses from a Yb:fiber laser from 240 fs to 15.7 fs. The system delivers 0.44 mJ of pulse energy, 22.4 W of average power at 50.8 kHz with an overall efficiency of more than 40%. These results demonstrate the capability of multipass-cell-based post-compression schemes to shift from the established near infrared region to the unexplored visible regime, enabling high efficiency generation of energetic ultrashort pulses at high repetition rates. The unique combination of parameters in the green spectral range offers immense potential for future development of high photon flux higher-order harmonic sources.