Abstract

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>₁ 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).

Simultaneous four-wave mixing and stimulated Raman spectroscopy: effects of Doppler broadening and neighboring lines

H. Moosmüller and C. Y. She
J. Opt. Soc. Am. B 4(12) 1977-1983 (1987)

Continuous-wave stimulated Raman scattering

C. H. Bryant and M. Golombok
Opt. Lett. 16(8) 602-604 (1991)

Raman Doppler velocimetry: a unified approach for measuring molecular flow velocity, temperature, and pressure

Reginald J. Exton and Mervin E. Hillard
Appl. Opt. 25(1) 14-21 (1986)

Raman lidar system for methane gas concentration measurements

J. Douglas Houston, Sebastian Sizgoric, Arkady Ulitsky, and John Banic
Appl. Opt. 25(13) 2115-2121 (1986)

Quantum-enhanced continuous-wave stimulated Raman scattering spectroscopy

Rayssa B. de Andrade, Hugo Kerdoncuff, Kirstine Berg-Sørensen, Tobias Gehring, Mikael Lassen, and Ulrik L. Andersen
Optica 7(5) 470-475 (2020)