Hollow-core fiber Fabry-Perot photothermal gas sensor

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

69 Citations (Scopus)


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 × 10-7in absorbance) by using 77 s averaging time.
Original languageEnglish
Pages (from-to)3025-3028
Number of pages4
JournalOptics Letters
Issue number13
Publication statusPublished - 1 Jul 2016

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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