90 fs pulses with >5 GW peak power from a high repetition rate Tm-doped fiber CPA system

Tm-doped fused silica fibers allow for the efficient, linear amplification of broad spectra in the 1.9 µm wavelength region. The single-channel fiber chirped pulse amplification system presented herein delivers a pulse-peak power of >5 GW and a nearly transform-limited pulse duration of 90 fs at 10 kHz repetition rate. An increase of the repetition rate to 100 kHz allowed for unprecedented 45 W average power and >4 GW peak power in this wavelength regime.