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Scanning dual-microcomb spectroscopy

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Abstract

Dual-comb spectroscopy (DCS) is a powerful tool in molecular spectroscopy benefiting from the advantages of high resolution and short measurement time. The recently developed soliton microcomb (SMC) can potentially transfer the dual-comb method to an on-chip platform. In this paper, we demonstrate DCS using two frequency scanning SMCs, termed scanning dual-microcomb spectroscopy (SDMCS). The two SMCs are generated by an auxiliary-assisted thermal balance scheme, and the pump laser frequency sweeps over one free spectral range of the microresonator (∼49 GHz) using a feedback control system. The proposed SDMCS has a spectral resolution of 12.5 MHz, which is determined by the minimum sweeping step of the pump laser. Using this SDMCS system, we perform three types of gas molecule absorption spectroscopy recognition and gas concentration detection. This study paves the way for integrated DCS with a high signal-to-noise ratio, high spectral resolution, and fast acquisition rate.

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Funding

This work was supported by the National Key R&D Program of China (Grant No. 2021YFB2800600), and National Natural Science Foundation of China (Grant No. 62075238).

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, 710119, China

    Yang Wang, Zhichuang Wang, Xinyu Wang, Wen Shao, Long Huang, Bo Liang, Brent E. Little, Wei Zhao, Weiqiang Wang & Wenfu Zhang

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Yang Wang, Zhichuang Wang, Xinyu Wang, Wen Shao, Long Huang, Bo Liang, Brent E. Little, Wei Zhao, Weiqiang Wang & Wenfu Zhang

  3. Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, 999077, China

    Sai T. Chu

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  1. Yang Wang
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  2. Zhichuang Wang
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  3. Xinyu Wang
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  9. Wei Zhao
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  10. Weiqiang Wang
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  11. Wenfu Zhang
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Correspondence to Weiqiang Wang or Wenfu Zhang.

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Wang, Y., Wang, Z., Wang, X. et al. Scanning dual-microcomb spectroscopy. Sci. China Phys. Mech. Astron. 65, 294211 (2022). https://doi.org/10.1007/s11433-022-1920-6

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  • DOI: https://doi.org/10.1007/s11433-022-1920-6

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