Share Email Print
cover

Proceedings Paper • new

Combination of lock-in detection with dual-comb spectroscopy
Format Member Price Non-Member Price
PDF $17.00 $21.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper 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.

Paper Details

Date Published: 21 May 2019
PDF: 8 pages
Proc. SPIE 10925, Photonic Instrumentation Engineering VI, 109251A (21 May 2019); doi: 10.1117/12.2509619
Show Author Affiliations
Hidenori Koresawa, Tokushima Univ. (Japan)
Japan Science and Technology Agency (Japan)
Kyuki Shibuya, Japan Science and Technology Agency (Japan)
Tokushima Univ. (Japan)
Takeo Minamikawa, Japan Science and Technology Agency (Japan)
Tokushima Univ. (Japan)
Akifumi Asahara, Japan Science and Technology Agency (Japan)
The Univ. of Electro-Communications (Japan)
Kaoru Minoshima, Japan Science and Technology Agency (Japan)
The Univ. of Electro-Communications (Japan)
Takeshi Yasui, Japan Science and Technology Agency (Japan)
Tokushima Univ. (Japan)


Published in SPIE Proceedings Vol. 10925:
Photonic Instrumentation Engineering VI
Yakov G. Soskind, Editor(s)

© SPIE. Terms of Use
Back to Top