Abstract:This paper reports on a trace gas monitor using a dual wavelength coherent light source. The laser spectrometer is based on difference frequency generation (DFG) techniques in a periodically poled lithium niobate (PPLN) crystal, naturally having two laser sources (i.e., signal and pump laser sources) in it. A newly proposed idea is to use residual signal DFB-LD power to tune to NH 3 absorption lines around at 1.536 µm when the DFG output wavelengths are accessed at 3.46 µm. In the experiments, the signal DFB-L… Show more
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