We have demonstrated self-starting, passive mode-locking of a Cr4+:YAG
laser using a saturable absorber mirror structure. Highly stable femt
osecond pulses tunable from 1488 to 1535 nm were generated with averag
e output powers ranging from 40 to 80 mW. Nearly transform limited pul
ses of 120 fs duration were obtained at 1488 nm.