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  • Received: Jan. 6, 2020

    Accepted: Apr. 23, 2020

    Posted: May. 29, 2020

    Published Online: May. 29, 2020

    The Author Email: Chen Jie (, Nitta Kazuki (, Zhao Xin (, Mizuno Takahiko (, Minamikawa Takeo (, Hindle Francis (Francis., Zheng Zheng (, Yasui Takeshi (

    DOI: 10.1117/1.AP.2.3.036004

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    Jie Chen, Kazuki Nitta, Xin Zhao, Takahiko Mizuno, Takeo Minamikawa, Francis Hindle, Zheng Zheng, Takeshi Yasui. Adaptive-sampling near-Doppler-limited terahertz dual-comb spectroscopy with a free-running single-cavity fiber laser[J]. Advanced Photonics, 2020, 2(3): 036004

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Advanced Photonics, Vol. 2, Issue 3, 036004 (2020)

Adaptive-sampling near-Doppler-limited terahertz dual-comb spectroscopy with a free-running single-cavity fiber laser 

Jie Chen1,2, Kazuki Nitta2,3, Xin Zhao1, Takahiko Mizuno3,4,5, Takeo Minamikawa3,4,5,6, Francis Hindle7, Zheng Zheng1,8,*, and Takeshi Yasui3,4,5,6,*

Author Affiliations

  • 1Beihang University, School of Electronic and Information Engineering, Beijing, China
  • 2Tokushima University, Graduate School of Advanced Technology and Science, Tokushima, Japan
  • 3JST, ERATO MINOSHIMA Intelligent Optical Synthesizer, Tokushima, Japan
  • 4Tokushima University, Institute of Post-LED Photonics, Tokushima, Japan
  • 5Tokushima University, Graduate School of Technology, Industrial and Social Sciences, Tokushima, Japan
  • 6Tokushima University, Research Cluster on “Multi-scale Vibrational Microscopy for Comprehensive Diagnosis and Treatment of Cancer”, Tokushima, Japan
  • 7Université du Littoral Côte d’Opale, Laboratoire de Physico-Chimie de l’Atmosphère, Dunkerque, France
  • 8Beihang University, Beijing Advanced Innovation Center for Big Data-based Precision Medicine, Beijing, China


Dual-comb spectroscopy (DCS) is an emerging spectroscopic tool with the potential to simultaneously achieve a broad spectral coverage and ultrahigh spectral resolution with rapid data acquisition. However, the need for two independently stabilized ultrafast lasers significantly hampers the potential application of DCS. We demonstrate mode-resolved DCS in the THz region based on a free-running single-cavity dual-comb fiber laser with the adaptive sampling method. While the use of a free-running single-cavity dual-comb fiber laser eliminates the need for two mode-locked lasers and their frequency control, the adaptive sampling method strongly prevents the degradation of spectroscopic performance caused by the residual timing jitter in the free-running dual-comb laser. Doppler-limit-approaching absorption features with linewidths down to 25 MHz are investigated for low-pressure acetonitrile/air mixed gas by comb-mode-resolved THz spectroscopy. The successful demonstration clearly indicates its great potential for the realization of low-complexity, Doppler-limited THz spectroscopy instrumentation.


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