We report on the first single-frequency nanosecond optical parametric oscillator (OPO) emitting in the longwave infrared, and use it to perform standoff detection of ammonia vapor by differential spectrometry. The OPO is based on orientation-patterned GaAs (OP-GaAs) pumped by a pulsed single-frequency Tm:YAP microlaser. Single-longitudinal mode emission is obtained owing to a nested cavity OPO (NesCOPO) scheme. The OPO is tuned over 700 nm around 10.4 μm, allowing to measure the absorption spectrum of ammonia across several lines at atmospheric pressure. The potential of this OPO for standoff detection of hazardous gases is also discussed.
J. Armougom, Q. Clément, J.-M. Melkonian, J.-B. Dherbecourt, M. Raybaut, A. Grisard, E. Lallier, B. Gérard, B. Faure, G. Souhaité, and A. Godard, "Single-frequency tunable long-wave infrared OP-GaAs OPO for gas sensing," Proc. SPIE 10088, Nonlinear Frequency Generation and Conversion: Materials and Devices XVI, 100880Z (Presented at SPIE LASE: February 01, 2017; Published: 20 February 2017); https://doi.org/10.1117/12.2255620.
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