Combination of lock-in detection with dual-comb spectroscopy

Hidenori Koresawa; Kyuki Shibuya; Takeo Minamikawa; Akifumi Asahara; Kaoru Minoshima; Takeshi Yasui

doi:10.1117/12.2509619

21 May 2019 Combination of lock-in detection with dual-comb spectroscopy

Hidenori Koresawa, Kyuki Shibuya, Takeo Minamikawa, Akifumi Asahara, Kaoru Minoshima, Takeshi Yasui

Proceedings Volume 10925, Photonic Instrumentation Engineering VI; 109251A (2019) https://doi.org/10.1117/12.2509619
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

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.

Citation Download Citation

Hidenori Koresawa, Kyuki Shibuya, Takeo Minamikawa, Akifumi Asahara, Kaoru Minoshima, and Takeshi Yasui "Combination of lock-in detection with dual-comb spectroscopy", Proc. SPIE 10925, Photonic Instrumentation Engineering VI, 109251A (21 May 2019); https://doi.org/10.1117/12.2509619

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