Journal
OPTICS LETTERS
Volume 43, Issue 7, Pages 1566-1569Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.43.001566
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Funding
- National Natural Science Foundation of China (NSFC) [61290313, 61535004]
- Hong Kong Polytechnic University (PolyU) [1-ZVG4, 4-BCD1]
- University Grants Committee of Hong Kong [PolyU 152206/17E]
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We present an all-fiber intracavity photothermal (IC-PT) spectroscopic gas sensor with a hollow-core photonic bandgap fiber (HC-PBF) gas cell. The gas cell is placed inside a fiber-ring laser cavity to achieve higher laser light intensity in the hollow core and hence higher PT modulation signal. An experiment with a 0.62-m-long HC-PBF gas cell demonstrated a noise equivalent concentration of 176 ppb acetylene. Theoretical modeling shows that the IC-PT sensor has the potential of achieving sub-ppb (parts-per-billion) acetylene detection sensitivity. (c) 2018 Optical Society of America
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