Performance optimization of hollow-core fiber photothermal gas sensors

Yuechuan Lin, Wei Jin, Fan Yang, Yanzhen Tan, Hoi Lut Ho

Research output: Journal article publicationJournal articleAcademic researchpeer-review

36 Citations (Scopus)


We report performance optimization of hollow-core photonic bandgap fiber (HC-PBF) photothermal (PT) gas sensors. The PT phase modulation efficiency of a C2H2filled HC-PBF (HC-1550-02) is found independent of the pump modulation frequency for up to ∼330 kHz, but starts to drop quickly to 10% of the maximum value at a couple of megahertz. With a 1.1 m long HC-PBF gas cell with angle-cleaved single-mode fiber/HC-PBF joints to reduce reflection and a modified 3 × 3 Sagnac interferometer with balanced detection for phase demodulation, a noise equivalent concentration of ∼67 ppb C2H2is achieved with a 1 s time constant, and it goes down to ∼18 ppb with 145 s integration time. The system has good long-term stability and exhibits signal fluctuations of <1% over a ∼5 h period.
Original languageEnglish
Pages (from-to)4712-4715
Number of pages4
JournalOptics Letters
Issue number22
Publication statusPublished - 15 Nov 2017

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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