Abstract
Continuous-wave optical parametric oscillators (OPO) emerge as new powerful sources for broadly tunable infrared radiation. Based on periodically poled Lithium Niobate (PPLN) a singly-resonant OPO (SRO) with pump enhancement delivers idler radiation of about 100 mW between 3 and 4 μm. Here it is applied for photoacoustic trace gas detection. The free idler wavelength selection allows one to use the strongest absorption features for the molecules under study. Ethane and methane are detected at 3.34 μm and 3.26 μm with detection limits of 0.46 and 0.26 ppb, respectively. Ethylene was detected with 4 ppb at 3.35 μm. This new compact source opens great opportunities for the development of transportable photoacoustic detectors.
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