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Quasi-Continuous Wave Stimulated Raman Technique for Local Methane Concentration Measurements at Atmospheric Pressure

Volume 49, Number 10 (Oct. 1995) Page 1507-1512

Pinette, Thomas C.; Yin, Huiqi; Laurendeau, Normand M.


We report the application of quasi-continuous wave (cw) inverse stimulated Raman spectroscopy (SRS) to the quantitative measurement of methane concentrations in atmospheric mixtures near room temperature. The quasi-cw SRS signal, with the use of the v1 fundamental of methane (2916 cm-1), is shown to be proportional to the powers of both the pump and probe lasers as well as to the methane concentration. The current minimum detectable signal corresponds to ~200 ppm (v/v).