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Opt Lett. 2011 Mar 1;36(5):751-3. doi: 10.1364/OL.36.000751.

Picosecond tunable mode locking of a Cr2+:ZnSe laser with a nonlinear mirror.

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  • 1ONERA-The French Aerospace Laboratory, Palaiseau, France.


We report on a nonlinear mirror (NLM) scheme that enables, for the first time to the best of our best knowledge, tunable mode locking of a Cr2+:ZnSe laser in the picosecond regime. The NLM-used as the output coupler of the laser cavity-consists of a periodically poled lithium niobate (PPLN) crystal with a fan-out grating coupled with a dichroic mirror and a wedged dispersive YAG plate. The Cr2+:ZnSe laser, pumped by a CW thulium-doped fiber laser, delivers 85 ps pulses at a repetition rate of 220 MHz with a 300 mW average power. Thanks to the use of a fan-out PPLN crystal, we benefit from the wide tunability of the Cr2+:ZnSe laser and achieve mode locking over the whole 2.44-2.55 μm range while maintaining a narrow-linewidth emission suitable for time-resolved nonlinear spectroscopy applications.

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