Dual-comb photothermal spectroscopy

Qiang Wang (), Zhen Wang (), Hui Zhang, Shoulin Jiang, Yingying Wang, Wei Jin and Wei Ren ()
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Qiang Wang: State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences
Zhen Wang: The Chinese University of Hong Kong
Hui Zhang: State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences
Shoulin Jiang: The Hong Kong Polytechnic University
Yingying Wang: Institute of Photonics Technology, Jinan University
Wei Jin: The Hong Kong Polytechnic University
Wei Ren: The Chinese University of Hong Kong

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Dual-comb spectroscopy (DCS) has revolutionized optical spectroscopy by providing broadband spectral measurements with unprecedented resolution and fast response. Photothermal spectroscopy (PTS) with a pump-probe configuration offers a highly sensitive gas sensing method, which is normally performed using a single-wavelength pump laser. The merging of PTS with DCS may enable a spectroscopic method by taking advantage of both technologies, which has never been studied yet. Here, we report dual-comb photothermal spectroscopy (DC-PTS) by passing dual combs and a probe laser through a gas-filled anti-resonant hollow-core fiber, where the generated multi-heterodyne modulation of the refractive index is sensitively detected by an in-line interferometer. As an example, we have measured photothermal spectra of acetylene over 1 THz, showing a good agreement with the spectral database. Our proposed DC-PTS provides opportunities for broadband gas sensing with super-fine resolution and high sensitivity, as well as with a small sample volume and compact configuration.

Date: 2022
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DOI: 10.1038/s41467-022-29865-6

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