Hydrogen Sulfide Detection in the Midinfrared Using a 3D-Printed Resonant Gas Cell

Figure 8

Second harmonic signal: (a) when the pump laser was tuned across the absorption line of H₂S at 1247.2 cm^-1 and (b) for the peak-to-peak amplitude of the second harmonic for a sample gas mixture from 100 ppm to 500 ppm at 1 bar of pressure and room temperature.

(a)

(b)