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13 October 2015 Pulsed, tunable, single-frequency OP-GaAs OPO for the standoff detection of hazardous chemicals in the longwave infrared
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Abstract
We present our results on the first nanosecond single-frequency optical parametric oscillator (OPO) emitting in the longwave infrared. It is based on orientation-patterned GaAs (OP-GaAs), and can be pumped by a pulsed singlefrequency Tm:YAP microlaser thanks to its low oscillation threshold of 10 μJ. Stable single-longitudinal mode emission of the OPO is obtained owing to Vernier spectral filtering provided by its nested cavity OPO (NesCOPO) scheme. Crystal temperature tuning covers the 10.3-10.9 μm range with a single quasi-phase-matching period of 72.6 μm. Shortrange standoff detection of ammonia vapor around 10.4 μm is performed with this source. We believe that this achievement paves the way to differential absorption lidars in the LWIR with increased robustness and reduced footprint.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Q. Clément, J.-M. Melkonian, J.-B. Dherbecourt, M. Raybaut, A. Grisard, E. Lallier, B. Gérard, B. Faure, G. Souhaité, and A. Godard "Pulsed, tunable, single-frequency OP-GaAs OPO for the standoff detection of hazardous chemicals in the longwave infrared", Proc. SPIE 9649, Electro-Optical Remote Sensing, Photonic Technologies, and Applications IX, 964904 (13 October 2015); https://doi.org/10.1117/12.2194771
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