Observation of Terahertz Frequency Comb and Application for Spectroscopy

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  • IYONAGA Yuki
    Graduate School of Engineering Science, Osaka University
  • HSIEH Yi-Da
    Graduate School of Engineering Science, Osaka University
  • SAKAGUCHI Yoshiyuki
    Graduate School of Engineering Science, Osaka University
  • YOKOYAMA Shuko
    Graduate School of Engineering Science, Osaka University Micro Optics Co.,Ltd.
  • INABA Hajime
    National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology
  • MINOSHIMA Kaoru
    National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology
  • ARAKI Tsutomu
    Graduate School of Engineering Science, Osaka University
  • YASUI Takeshi
    Graduate School of Engineering Science, Osaka University Institute of Technology and Science, University of Tokushima

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Other Title
  • テラヘルツ周波数コムの観測と分光計測への応用
  • Laser Original テラヘルツ周波数コムの観測と分光計測への応用
  • Laser Original テラヘルツ シュウハスウ コム ノ カンソク ト ブンコウ ケイソク エ ノ オウヨウ

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Abstract

We observed the hyperfine-structured spectrum of a terahertz (THz) frequency comb with asynchronousoptical- sampling THz time-domain spectroscopy by extending the measured time window of the pulsed THz electric field by up to ten pulse periods. The observed THz comb mode, having a linewidth of 25 MHz and a frequency interval of 250 MHz, can be used as a precise and accurate frequency marker for broadband THz spectrum because it is traceable to a microwave frequency standard via laser control. We further demonstrated THz spectroscopy of sugar tablets and low-pressure water vapor based on THz comb, indicating that the proposed method enables high-accuracy, high-resolution, and broadband THz spectroscopy.

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