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Dual-comb photothermal spectroscopy.

Qiang Wang1,2, Zhen Wang3, Hui Zhang4,5

  • 1State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 130033, Changchun, China. wangqiang@ciomp.ac.cn.

Nature Communications
|April 22, 2022
PubMed
Summary
This summary is machine-generated.

We introduce dual-comb photothermal spectroscopy (DC-PTS), a novel technique combining dual-comb spectroscopy and photothermal spectroscopy for highly sensitive gas sensing. This method achieves broadband measurements with exceptional resolution and speed.

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Area of Science:

  • Optical Spectroscopy
  • Gas Sensing Technologies
  • Fiber Optics

Background:

  • Dual-comb spectroscopy (DCS) offers broadband measurements with high resolution and speed.
  • Photothermal spectroscopy (PTS) provides sensitive gas detection, typically using a single laser.
  • Combining DCS and PTS presents an unexplored avenue for advanced spectroscopic methods.

Purpose of the Study:

  • To develop and demonstrate dual-comb photothermal spectroscopy (DC-PTS).
  • To leverage the strengths of both DCS and PTS for enhanced gas sensing.
  • To explore the potential of DC-PTS for broadband, high-resolution spectral measurements.

Main Methods:

  • Utilized dual optical frequency combs and a probe laser.
  • Employed a gas-filled anti-resonant hollow-core fiber.
  • Detected multi-heterodyne modulation of the refractive index via an in-line interferometer.

Main Results:

  • Successfully measured broadband photothermal spectra of acetylene over 1 THz.
  • Achieved excellent agreement between experimental data and spectral databases.
  • Demonstrated the capability for sensitive, high-resolution spectral analysis.

Conclusions:

  • DC-PTS offers a novel approach for broadband gas sensing.
  • The technique provides super-fine spectral resolution and high sensitivity.
  • DC-PTS is suitable for compact configurations and small sample volumes, opening new possibilities in spectroscopy.