Gapless THz Comb Spectroscopy

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  • YASUI Takeshi
    Institute of Technology and Science, The University of Tokushima MINOSHIMA Intelligent Optical Synthesizer Project, JST-ERATO
  • HSIEH Yi-Da
    Institute of Technology and Science, The University of Tokushima MINOSHIMA Intelligent Optical Synthesizer Project, JST-ERATO

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Other Title
  • ギャップレスTHzコム分光法
  • ギャップレス THz コム ブンコウホウ

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We demonstrated combination of gapless terahertz (THz) comb with asynchronous-optical-sampling THz time-domain spectroscopy (ASOPS-THz-TDS), namely gapless THz comb spectroscopy. The mode-resolved spectrum of THz comb was observed by measuring the temporal waveform of the THz pulse train with ASOPS-THz-TDS and calculating Fourier transform of it. Furthermore, the gapless THz comb was realized by interpolating frequency gaps between the comb modes with sweeping of a laser mode-locked frequency. The demonstration of low-pressure gas spectroscopy with gapless THz comb spectroscopy clearly indicated that the spectral resolution was decreased down to 2.5-MHz linewidth of the comb mode and the spectral accuracy was enhanced to 10‒7 within the spectral range of 1 THz. The proposed method will be a powerful tool to simultaneously achieve high resolution, high accuracy, and broad spectral coverage in THz spectroscopy.

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