Hollow-Core Fiber-Based Mid-Infrared Photothermal Spectroscopy for Multi-Component Gas Sensing

Kaiyuan Zheng, Haihong Bao (Corresponding Author), Wenxuan Luo, Fei Liu, Feifan Chen, Hanyu Liao, Shuangxiang Zhao, Shoulin Jiang, Chuantao Zheng, Hoi Lut Ho, Shoufei Gao, Wei Jin (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review


We report a mid-infrared (MIR) photothermal laser spectroscopy system for multi-component gas sensing with a single broadband anti-resonant hollow-core fiber gas cell. Three MIR pump lasers are used as the excitation sources to generate photothermal phase modulation and a near-infrared probe laser is employed to detect the photothermal phase modulation by using a Fabry-Perot interferometer configuration. Simultaneous detection of carbon monoxide (CO), carbon dioxide (CO2), ethylene (C2H4), and ethane (C2H6) are experimentally demonstrated using time-division multiplexing. A noise-equivalent concentration (NEC) of 57 parts-per-billion (ppb) for CO, 300 ppb for CO2, 430 ppb for C2H4 and 73 ppb for C2H6 are achieved with 1 s lock-in time constant. Allan deviation analysis reveals that the NEC can be reduced to 35, 120, 310, and 49 ppb for CO, CO2, C2H4 and C2H6, respectively, with an averaging time of 280 s. The dynamic range of the system is measured to be more than 4 orders of magnitude for all of the four gas components.

Original languageEnglish
Article number5600606
Pages (from-to)1-6
Number of pages6
JournalIEEE Journal of Selected Topics in Quantum Electronics
Issue number6
Publication statusPublished - 1 Nov 2024


  • Mid-infrared
  • hollow-core fiber
  • multi-gas detection
  • optical fiber sensor
  • photothermal spectroscopy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Hollow-Core Fiber-Based Mid-Infrared Photothermal Spectroscopy for Multi-Component Gas Sensing'. Together they form a unique fingerprint.

Cite this