Oxygen gas sensing with photothermal spectroscopy in a hollow-core negative curvature fiber

Yingzhen Hong, Haihong Bao, Wei Jin, Shoulin Jiang, Hoi Lut Ho, Shoufei Gao, Yingying Wang

Research output: Journal article publicationLetterpeer-review

9 Citations (Scopus)


We demonstrate a compact all-fiber oxygen sensor using photothermal interferometry with a short length (4.3 cm) of hollow-core negative curvature fibers. The hollow-core fiber has double transmission windows covering both visible and near-infrared wavelength regions. Absorption of a pump laser beam at 760 nm produces photothermal phase modulation and a probe Fabry-Perot interferometer operating at 1550 nm is used to detect the phase modulation. With wavelength modulation and first harmonic detection, a limit of detection down to 54 parts per million (ppm) with a 600-s averaging time is achieved, corresponding to a normalized equivalent absorption of 7.7 × 10−8 cm−1. The oxygen sensor has great potential for in situ detection applications.

Original languageEnglish
Article number6084
Pages (from-to)1-9
Number of pages9
JournalSensors (Switzerland)
Issue number21
Publication statusPublished - 1 Nov 2020


  • Hollow-core fiber
  • Optical fiber sensor
  • Oxygen detection
  • Photothermal interferometry

ASJC Scopus subject areas

  • Analytical Chemistry
  • Information Systems
  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Instrumentation
  • Electrical and Electronic Engineering


Dive into the research topics of 'Oxygen gas sensing with photothermal spectroscopy in a hollow-core negative curvature fiber'. Together they form a unique fingerprint.

Cite this