Low-loss GaInNAs saturable Bragg reflector for mode-locking of a femtosecond Cr/sup 4+/ : forsterite-laser

A GaInNAs saturable Bragg reflector is used to mode-lock a Cr/sup 4+/ : forsterite solid-state laser. This low-loss saturable absorber mediates the generation of tunable femtosecond pulses having durations as short as 62 fs in the 1300-nm spectral region.