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Laser specifications for a spaceborne sensitive measurement of CO2, by differential absorption LIDAR (DIAL) at 2.05 mum, have been derived in terms of output energy, frequency stability and beam quality. To achieve such operation, single longitudinal mode (SLM) operation and fine frequency control is needed. In previous work, the authors have developed an optical parametric oscillator based set-up...
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...
For CO2 differential-absorption LIDAR, the single-mode output of a type-II PPLN entangled-cavity nanosecond doubly-resonant OPO emitting at 2.05 mum is amplified to 11 mJ, with 3 MHz rms frequency stability and a M2 < 1.9.
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.
We report on experiments carried out with improved pumping schemes and present modeling for further enhancement of direct 8-12 mum generation by self-DFM in Cr:ZnSe laser slabs using a Tm:YLF 1.9-mum pulsed pump source.
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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