Abstract
We have investigated 4-μm-band absorption lines for in situ detection using a mid-infrared laser source based on difference frequency generation in a quasi-phase-matched waveguide. In the wavelength range of 4.09400–4.10600 μm, there were strong absorption lines. The maximum absorption coefficient at a concentration of 170 ppmv was estimated to be about at a gas temperature of 190°C. In coexistence with , the reduction of the absorption peak height was observed, which was caused by sulfuric acid formation. We discuss a method of using an equilibrium curve to derive the total molecule concentration.
© 2016 Optical Society of America
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