Abstract

Generation of femtosecond pulses from a continuous-wave mode-locked chromium-doped forsterite (Cr4+:Mg2SiO4) laser is reported. The forsterite laser was actively mode locked by using an acousto-optic modulator operating at 78 MHz with two Brewster high-dispersion glass prisms for intracavity chirp compensation. Transform-limited sub-100-fs pulses were routinely generated in the TEM00 mode with 85 mW of continuous power (with 1% output coupler), tunable over 1230–1280 nm. The shortest pulses measured had a 60-fs pulse width.

© 1992 Optical Society of America

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