Femtosecond 3-mJ 5-kHz cw-pumped Ho:YAG CPA

We demonstrate the first femtosecond Tm-fiber-pumped Ho:YAG room-temperature CPA system delivering scalable multi-mJ multi-kHz pulses with a bandwidth exceeding 12 nm and the average power of 15 W. The output is partially recompressed to 530 fs FWHM.