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Optical feedback linear cavity enhanced absorption spectroscopy
Author(s) -
Jianfei Tian,
Gang Zhao,
Adam J. Fleisher,
Weiguang Ma,
Suotang Jia
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.431934
Subject(s) - optics , spectroscopy , cavity ring down spectroscopy , absorption (acoustics) , materials science , absorption spectroscopy , attenuation coefficient , refractive index , physics , quantum mechanics
A simple and universal technique for performing optical feedback cavity enhanced absorption spectroscopy with a linear Fabry-Pérot cavity is presented. We demonstrate through both theoretical analysis and experiment that a diode laser can be sequentially stabilized to a series of cavity modes without any influence from the direct reflection if the feedback phase is appropriately controlled. With robust handling of the feedback phase and help from balanced detection, a detection limit of 1.3 × 10 -9 cm -1 was achieved in an integration time of 30 s. The spectrometer performance enabled precision monitoring of atmospheric methane (CH 4 ) concentrations over a time period of 72 h.

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