Hidenori Koresawa, Kyuki Shibuya, Takeo Minamikawa, Akifumi Asahara, Kaoru Minoshima, Takeshi Yasui
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10925/109251A/Combination-of-lock-in-detection-with-dual-comb-spectroscopy/10.1117/12.2509619.short?SSO=1
Dual-comb spectroscopy (DCS) is a powerful tool
for gas spectroscopy due to high resolution, high accuracy, broadband spectral
coverage, and rapid data acquisition, based on optical frequency comb (OFC)
traceable to a frequency standard. In DCS, after a temporal waveform of
interferogram is acquired in time domain, the corresponding mode-resolved OFC
spectrum is obtained by fast Fourier transform (FFT) calculation of the
acquired interferogram. However, FFT calculation of huge-sized temporal data
spends significantly longer time than the acquisition time of interferogram,
making it difficult to response the transient signal change. In this article,
we demonstrate frequency-domain DCS by a combination of DCS with lock-in
detection (LID), namely LID-DCS. LID-DCS directly extracts an arbitrary OFC
mode from a vast number of OFC modes without the need for FFT calculation by
the synchronous detection at a LID reference frequency while maintaining high
resolution and high accuracy. Usefulness of LID-DCS is demonstrated in rapid
monitoring of transient signal change and spectroscopy of hydrogen cyanide gas
by comparing with usual DCS.
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