Qiang Wang, Zhen Wang, Hui Zhang, Shou-Ping Jiang, Yingying Wang, W. Jin, W. Ren
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Broadband photothermal spectroscopy for gas sensing with two frequency combs
We demonstrate scan-free broadband photothermal spectroscopy for gas sensing. The gas refractive index is modulated by the multiheterodyne beating of two frequency combs and demodulated by an in-line Fabry‐Pérot interferometer fabricated by a hollow-core fiber.