High-repetition-rate cw-pumped Cr(3+):LiSrAlF(6) femtosecond regenerative amplifier

We have developed a cw krypton-ion-laser-pumped Cr(3+):LiSrAlF(6) regenerative amplifier for femtosecond pulses operating at a 5-kHz repetition rate. After recompression, we obtained 3.6-microJ, 170-fs pulses at 825 nm. By focusing these pulses in a cell of water, we generated a white-light continuum.