Abstract
We report on the application of polarization spectroscopy in the mid-infrared spectral region for the detection of methane by probing its asymmetric ro-vibrational transitions. Tunable infrared laser radiation, near 3.4 μm, was obtained from difference-frequency generation in a LiNbO3 crystal. Infrared polarization spectroscopy (IRPS) spectra of the P, Q and R branches of the ν3 band, recorded with both linearly and circularly polarized pump beams, are presented. The experiments were performed in an atmospheric pressure gas jet with methane diluted with Ar. An IRPS spectrum with signal-to-noise ratio better than 104 was observed. The dependence of the IRPS signal intensity on the methane mole fraction and on the pumping laser power density was investigated.
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33.20.Ea; 52.35.Mw
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Li, Z., Rupinski, M., Zetterberg, J. et al. Detection of methane with mid-infrared polarization spectroscopy. Appl Phys B 79, 135–138 (2004). https://doi.org/10.1007/s00340-004-1475-9
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DOI: https://doi.org/10.1007/s00340-004-1475-9