Open AccessOptical feedback linear cavity enhanced absorption spectroscopy
Author(s) -
Jianfei Tian,
Zhao Gang,
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 , tunable diode laser absorption spectroscopy , spectrometer , spectroscopy , cavity ring down spectroscopy , materials science , optical cavity , absorption spectroscopy , reflection (computer programming) , time delay and integration , absorption (acoustics) , phase (matter) , laser , diode , detection limit , fabry–pérot interferometer , total internal reflection , tunable laser , optoelectronics , physics , chemistry , computer science , chromatography , quantum mechanics , programming language
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.