Intracavity frequency-doubled femtosecond Cr~(4+):forsterite laser

摘要

The generation of femtosecond optical pulses centered at ～620 nm directly from an all-solid-state laser oscillator is reported. Red pulses with pulse widths of the order of 170 fs were obtained with 24-mW average power at an 81-MHz repetition rate. They were achieved by intracavity frequency doubling of a mode-locked Cr~(4+):forsterite laser with a 1-mm-thick β-BaB_(2)O_(4) crystal. The process of laser mode locking was modified by surface coating the doubling crystal.