Abstract
A novel highly sensitive method to detect the concentration of trace gas for environmental purposes is proposed. This method includes the application of frequency modulation for stabilization of laser frequency, together with optical heterodyne measurement. The shift of resonance frequency of the Fabry-Perot cavity resonator is due to the change of refractive index, accompanied by the dispersion effect due to the presence of a target gas (e.g., methane, carbon dioxide or nitrogen dioxide) inside the Fabry-Perot cavity.
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Mugino, A., Yamamoto, T., Omatsu, T. et al. High Sensitive Detection of Trace Gases Using Optical Heterodyne Method with a High Finesse Intra-Cavity Resonator. OPT REV 3, 243–250 (1996). https://doi.org/10.1007/s10043-996-0243-y
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DOI: https://doi.org/10.1007/s10043-996-0243-y