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We report the continuous mode-locked operation of a picosecond, singly-resonant, synchronously-pumped optical parametric oscillator (SPOPO) based on ZGP. The ZGP SPOPO emits in the 4-6 μm range with signal power higher than 800 mW.
We numerically investigate the use of a PPLN nonlinear mirror to achieve pulsed operation of a Cr2+:ZnSe laser. We discuss the effect of various parameters on the laser dynamics (CW, Q-switched and/or mode-locked operation).
Here, we propose to apply to Cr2+:ZnSe an original mode-locking technique, using an intracavity second order nonlinear mirror, and efficiently demonstrated on near-infrared (lambda=1 mum) laser sources. Indeed, efficiency and reliability reached by second order non linear crystals, such as PPLN, allow a transposition of the nonlinear mirror concept from near-infrared to mid-infrared laser sources...
We show that gain in an OPO with a large walkoff between the pump and signal saturates just like a laser gain and thus CW pumped OPO can be directly mode-locked with high conversion efficiency.
Active mode-locking of a near degenerate (~1064 nm) doubly resonant periodically poled LiNbO3 OPO pumped at 532 nm is reported. Pulse durations as short as 700 ps are observed.
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