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Title: Hollow-core fiber Fabry-Perot photothermal gas sensor
Authors: Yang, F 
Tan, Y 
Jin, W 
Lin, Y 
Qi, Y 
Ho, HL 
Issue Date: 1-Jul-2016
Source: Optics letters, 1 July 2016, v. 41, no. 13, p. 3025-3028
Abstract: A highly sensitive, compact, and low-cost trace gas sensor based on photothermal effect in a hollow-core fiber Fabry-Perot interferometer (FPI) is described. The Fabry-Perot sensor is fabricated by splicing a piece of hollow-core photonic bandgap fiber (HC-PBF) to single-mode fiber pigtails at both ends. The absorption of a pump beam in the hollow core results in phase modulation of probe beam, which is detected by the FPI. Experiments with a 2 cm long HC-PBF with femtosecond laser drilled side-holes demonstrated a response time of less than 19 s and noise equivalent concentration (NEC) of 440 parts-per-billion (ppb) using a 1 s lock-in time constant, and the NEC goes down to 117 ppb (2.7 × 10-7 in absorbance) by using 77 s averaging time.
Publisher: Optical Society of America
Journal: Optics letters 
ISSN: 0146-9592
EISSN: 1539-4794
DOI: 10.1364/OL.41.003025
Rights: Journal © 2016 Optical Society of America
© 2016 Optica Publishing Group. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.
The following publication Fan Yang, Yanzhen Tan, Wei Jin, Yuechuan Lin, Yun Qi, and Hoi Lut Ho, "Hollow-core fiber Fabry–Perot photothermal gas sensor," Opt. Lett. 41, 3025-3028 (2016) is available at
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