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
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.4050) Lasers and laser optics : Mode-locked lasers
(140.5680) Lasers and laser optics : Rare earth and transition metal solid-state lasers
(190.2620) Nonlinear optics : Harmonic generation and mixing
(320.2250) Ultrafast optics : Femtosecond phenomena
Tzu-Ming Liu, Shi-Peng Tai, and Chi-Kuang Sun, "Intracavity Frequency-Doubled Femtosecond Cr4+:Forsterite Laser," Appl. Opt. 40, 1957-1960 (2001)