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We demonstrated combination of spectrally interleaved terahertz (THz) frequency comb with dual-comb spectroscopy, enabling us to achieve the spectral sampling equal to linewidth of the comb tooth in the low-pressure gas spectroscopy in THz region.
We proposed frequency-swept asynchronous-optical-sampling terahertz time-domain spectroscopy to further improve the spectral resolution. The spectral resolution achieved here was 2.2 MHz, which is two orders of magnitude smaller than the mode-locked frequency.
We fully interpolated frequency gaps between THz comb modes by tuning mode-locked frequencies in dual fiber lasers used for generation and detection of THz comb. The resulting gapless THz comb implies a possibility to enhance the spectral resolution in THz spectroscopy down to the linewidth of each comb mode.
We improved the spectral accuracy in asynchronous-optical-sampling THz time-domain spectroscopy (ASOPS-THz-TDS) by sweeping the mode-locked frequency in dual fiber lasers. We confirmed from THz spectroscopy of low-pressure water vapor that the achieved spectral accuracy largely exceeds the spectral resolution in ASOPS-THz-TDS.
We fully interpolated frequency gaps between THz-comb modes by their incremental sweeping at intervals of their linewidth, showing the possibility of enhancing the spectral resolution in THz spectroscopy to the linewidth of THz comb mode.
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