Carbon Dioxide Detection with High Sensitivity Based on Photo-Thermal Spectroscopy in Hollow-Core Optical Fiber

Shoulin Jiang, Wei Jin, Feifan Chen, Shoufei Gao, Hoi Lut Ho

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)

Abstract

The key techniques for the high-sensitivity detection of CO2 in the 2 μm band are studied based on photo-thermal spectroscopy in a hollow-core optical fiber, and a low-sharpness Fabry-Perot interferometer based on anti-resonance hollow-core optical fiber is adopted to demodulate the photo-thermal phase. For the R(18) absorption line of CO2 at 2004.02 nm, the noise equivalent volume fraction is about 4.7×10 -8 with a pump power of 180 mW and integration time of 1 s. To improve the stability of the detection system, we suppress the intra-cavity interference of pump light by applying the anti-reflection coating to the fiber end face and lock the probe wavelength to the quadrature point of the interferometer. Within 1 h, the signal fluctuation corresponding to CO2 standard gas with volume fraction of 10 -5 is about 4.7%. Noise analysis shows that the noise mainly comes from the phase noise and intensity noise of the probe laser in the current detection system.
Original languageEnglish
Article number136004
JournalGuangxue Xuebao/Acta Optica Sinica
Volume41
Issue number13
Publication statusPublished - Jul 2021

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