Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/61945
Title: Hollow-core fiber Fabry-Perot photothermal gas sensor
Authors: Yang, F
Tan, Y
Jin, W 
Lin, Y
Qi, Y
Ho, HL
Issue Date: 2016
Publisher: Optical Society of America
Source: Optics letters, 2016, v. 41, no. 13, p. 3025-3028 How to cite?
Journal: Optics letters 
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.
URI: http://hdl.handle.net/10397/61945
ISSN: 0146-9592
EISSN: 1539-4794
DOI: 10.1364/OL.41.003025
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