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15 June 2020 Acetylene photo-thermal spectroscopy using an optical heterodyne interferometer based on a double-pass acousto-optic frequency shifter
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Proceedings Volume 11523, Optical Technology and Measurement for Industrial Applications 2020; 1152309 (2020) https://doi.org/10.1117/12.2574769
Event: SPIE Technologies and Applications of Structured Light, 2020, Yokohama, Japan
Abstract
We demonstrate the photo-thermal (PT) spectroscopy of a 1.53-μm acetylene line using an optical heterodyne interferometer (OHI). A double-pass acousto-optic modulator is used as the frequency shifter and beam splitter in the OHI. The PT excitation beam overlaps with the probe beam of OHI, and the PT-induced phase change on the probe beam is detected by the OHI. Due to the nearly equal path length of the OHI scheme, we can observe the PT signal without using feedback control to maintain the path difference of the OHI arms.
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Pin-Wei Huang, Che-Chung Chou, Tyson Lin, and Sheng-Hua Lu "Acetylene photo-thermal spectroscopy using an optical heterodyne interferometer based on a double-pass acousto-optic frequency shifter", Proc. SPIE 11523, Optical Technology and Measurement for Industrial Applications 2020, 1152309 (15 June 2020); https://doi.org/10.1117/12.2574769
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