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 <i>v</i><sub>1</sub> fundamental of methane (2916 cm<sup>-1</sup>), 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).
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