All-fiber gas sensor with intracavity photothermal spectroscopy

Yan Zhao, Wei Jin, Yuechuan Lin, Fan Yang, Hoi Lut Ho

Research output: Journal article publicationJournal articleAcademic researchpeer-review

19 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1566-1569
Number of pages4
JournalOptics Letters
Issue number7
Publication statusPublished - 1 Apr 2018

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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