Abstract

We report on an extended-cavity mode-locked laser based on an Yb:CALGO crystal operating either at 27MHz and 93fs pulse duration or at 15MHz and 170fs duration single-pulse regime. To the best of our knowledge this is the first demonstration of an extended-cavity oscillator based on Yb-doped crystal producing sub-100fs pulses. The pulse energy was 24nJ directly at the output of the oscillator (and 17nJ after compression). Based on a similar design, we also demonstrate an unprecedented double-pulse dual-wavelength femtosecond regime. An explanation of this atypical regime is proposed.

© 2009 Optical Society of America

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