期刊
ADVANCED PHOTONICS
卷 2, 期 3, 页码 -出版社
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
DOI: 10.1117/1.AP.2.3.036004
关键词
optical comb; terahertz; dual-comb spectroscopy; molecular spectroscopy
类别
资金
- Exploratory Research for Advanced Technology (ERATO) MINOSHIMA Intelligent Optical Synthesizer (IOS) Project from the Japanese Science and Technology Agency [JPMJER1304]
- Ministry of Education, Culture, Sports, Science, and Technology of Japan [19H00871, 26246031]
- Subsidy for Regional University and Regional Industry Creation, Cabinet Office, Japan
- NSFC [61435002, 61521091, 61675014, 61675015]
- Fundamental Research Funds for the Central Universities
- Grants-in-Aid for Scientific Research [26246031, 19H00871] Funding Source: KAKEN
Dual-comb spectroscopy (DCS) is an emerging spectroscopic tool with the potential to simultaneously achieve a broad spectral coverage and ultrahigh spectral resolution with rapid data acquisition. However, the need for two independently stabilized ultrafast lasers significantly hampers the potential application of DCS. We demonstrate mode-resolved DCS in the THz region based on a free-running single-cavity dual-comb fiber laser with the adaptive sampling method. While the use of a free-running single-cavity dual-comb fiber laser eliminates the need for two mode-locked lasers and their frequency control, the adaptive sampling method strongly prevents the degradation of spectroscopic performance caused by the residual timing jitter in the free-running dual-comb laser. Doppler-limit-approaching absorption features with linewidths down to 25 MHz are investigated for low-pressure acetonitrile/air mixed gas by comb-mode-resolved THz spectroscopy. The successful demonstration clearly indicates its great potential for the realization of low-complexity, Doppler-limited THz spectroscopy instrumentation.
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