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Resonant optical cavity system with optical feedback suitable for trace gas detection by Raman spectroscopy
Resonant optical cavity system with optical feedback suitable for trace gas detection by Raman spectroscopy
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机译：具有光学反馈的谐振光学腔系统，适用于拉曼光谱法的痕量气体检测
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摘要
The present invention relates to a method for analyzing a gas by Raman spectroscopy, wherein the method provides a laser source (100) with a laser beam sweeping a frequency range comprising a plurality of resonant modes of an optical cavity (180) containing a gas to be analyzed. generated by; delivering a laser beam into the cavity; extracting a feedback beam, which is transmitted with phase and amplitude adjusted for the source, from the cavity; Detecting light intensity peaks 221-229 in the cavity laser beam during frequency range sweeping - the phase of the feedback beam is adjusted to reduce the shape asymmetry of the peaks, and the amplitude of the feedback beam is equal to that of zero intensity between the peaks. adjusted to reduce the gap -; and performing a spectral analysis of the inelastically scattered light within the cavity to determine the composition of the gas to be analyzed.
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