期刊
OPTICS LETTERS
卷 41, 期 13, 页码 3025-3028出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.41.003025
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资金
- National Natural Science Foundation of China (NSFC) [61290313]
- Hong Kong Polytechnic University (PolyU) [1-2VG4, ITS/348/14, PolyU 152229/15E]
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 x 10(-7) in absorbance) by using 77 s averaging time. (C) 2016 Optical Society of America
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