Passive coherent dual-comb spectroscopy based on optical-optical modulation with free running lasers

Chenglin Gu; Zhong Zuo; Daping Luo; Zejiang Deng; Yang Liu; Minglie Hu; Wenxue Li

doi:10.1186/s43074-020-0005-2

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Chenglin Gu, Zhong Zuo, Daping Luo, Zejiang Deng, Yang Liu, Minglie Hu, Wenxue Li. Passive coherent dual-comb spectroscopy based on optical-optical modulation with free running lasers[J]. PhotoniX. doi: 10.1186/s43074-020-0005-2

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Passive coherent dual-comb spectroscopy based on optical-optical modulation with free running lasers

doi: 10.1186/s43074-020-0005-2

1.
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, 200062, China
2.
Key Laboratory of Optoelectronic Information Science and Technology of Ministry of Education, Tianjin University, Tianjin, 300072, China

Funds:

National Natural Science Foundation of China (11904105, 11874153, 11804096).

National Key R&D Program of China (2017YFF0206000, 2018YFA0306301)

Received Date: 2019-11-13
Accepted Date: 2019-12-19

Available Online: 2020-03-06

Abstract

Abstract

Dual-comb spectroscopy is a powerful spectroscopic tool with ultrahigh-resolution, high-sensitivity properties, which opens up opportunities for the parallel detection of multi-species molecules. However, in its conventional form, highly stable laser combs with sophisticated control systems are required to perform dual-comb spectroscopy. Here, a passive mutually coherent dual-comb spectroscopy system via an optical-optical modulation method is addressed, where all fast phase-locking electronics are retired. Without post computer-based phase-correction, a high degree of mutual coherence between the two combs with a relative comb-tooth linewidth of 10 mHz is achieved, corresponding to a coherent time of 100 s. To demonstrate the performance and versatility of the system, the dual comb spectrometer is applied to record the mode-resolved single molecular spectra as well as parallel detected spectra of mixed gases including CO₂, CO and C₂H₂ that well agree with the established spectral parameters. Our technique exhibits flexible wavelength tuning capability in the near-infrared region and can be potentially extended to the mid-infrared region for more applications.
- Optical frequency combs,
- Comb spectroscopy,
- Optical-optical modulation,
- Molecular spectroscopy

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References(32)

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