Abstract

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 Cr4+:forsterite laser with a 1-mm-thick β-BaB2O4 crystal. The process of laser mode locking was modified by surface coating the doubling crystal.

© 2001 Optical Society of America

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