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Title: Modeling and performance evaluation of in-line Fabry-Perot photothermal gas sensors with hollow-core optical fibers
Authors: Bao, HH
Hong, Y 
Jin, W 
Ho, HL 
Wang, C 
Gao, S 
Wang, YY
Wang, P
Issue Date: 2020
Source: Optics express, 17 Feb. 2020, v. 28, no. 4, p. 5423-5435
Abstract: We study photothermal phase modulation in gas-filled hollow-core optical fibers with differential structural dimensions and attempt to develop highly sensitive practical gas sensors with an in-line Fabry-Perot interferometer for detection of the phase modulation. Analytical formulations based on a hollow-capillary model are developed to estimate the amplitude of photothermal phase modulation at low modulation frequencies as well as the -3 dB roll-off frequency, which provide a guide for the selection of hollow-core fibers and the pump modulation frequencies to maximize photothermal phase modulation. Numerical simulation with the capillary model and experiments with two types of hollow-core fibers support the analytical formulations. Further experiments with an Fabry-Perot interferometer made of 5.5-cm-long anti-resonant hollow-core fiber demonstrated ultra-sensitive gas detection with a noise-equivalent-absorption coefficient of 2.3 x 10(-9) cm(-1), unprecedented dynamic range of 4.3 x 10(6) and <2.5% instability over a period of 24 hours.
Publisher: Optical Society of America
Journal: Optics express 
EISSN: 1094-4087
DOI: 10.1364/OE.385670
Rights: © 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement (
Journal © 2020
© 2020 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
The following publication Haihong Bao, Yingzhen Hong, Wei Jin, Hoi Lut Ho, Chao Wang, Shoufei Gao, Yingying Wang, and Pu Wang, "Modeling and performance evaluation of in-line Fabry-Perot photothermal gas sensors with hollow-core optical fibers," Opt. Express 28, 5423-5435 (2020) is available at
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