Dual terahertz comb spectroscopy with a single free-running fibre laser

Abstract Dual terahertz (THz) comb spectroscopy enables high spectral resolution, high spectral accuracy, and broad spectral coverage; however, the requirement for dual stabilized femtosecond lasers hampers its versatility. We here report the first demonstration of dual THz comb spectroscopy using a...

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Autores principales:	Guoqing Hu, Tatsuya Mizuguchi, Ryo Oe, Kazuki Nitta, Xin Zhao, Takeo Minamikawa, Ting Li, Zheng Zheng, Takeshi Yasui
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f328ec574ec24db0925a3171040ca9c7
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spelling	oai:doaj.org-article:f328ec574ec24db0925a3171040ca9c72021-12-02T15:08:00ZDual terahertz comb spectroscopy with a single free-running fibre laser10.1038/s41598-018-29403-92045-2322https://doaj.org/article/f328ec574ec24db0925a3171040ca9c72018-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-29403-9https://doaj.org/toc/2045-2322Abstract Dual terahertz (THz) comb spectroscopy enables high spectral resolution, high spectral accuracy, and broad spectral coverage; however, the requirement for dual stabilized femtosecond lasers hampers its versatility. We here report the first demonstration of dual THz comb spectroscopy using a single free-running fibre laser. By tuning the cavity-loss-dependent gain profile with an intracavity Lyot filter together with precise management of the cavity length and dispersion, dual-wavelength comb light beams with slightly detuned repetition frequencies are generated in a single laser cavity. Due to sharing of the same cavity, such comb light beams suffer from common-mode fluctuation of the repetition frequency, and hence the corresponding frequency difference between them is passively stable around a few hundred hertz within millihertz fluctuation. While greatly reducing the size, complexity, and cost of the laser source by use of a single free-running fibre laser, the dual THz comb spectroscopy system maintains a spectral bandwidth and dynamic range of spectral power comparable to a system equipped with dual stabilized fibre lasers, and can be effectively applied to high-precision spectroscopy of acetonitrile gas at atmospheric pressure. The demonstrated results indicate that this system is an attractive solution for practical applications of THz spectroscopy and other applications.Guoqing HuTatsuya MizuguchiRyo OeKazuki NittaXin ZhaoTakeo MinamikawaTing LiZheng ZhengTakeshi YasuiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-9 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Guoqing Hu Tatsuya Mizuguchi Ryo Oe Kazuki Nitta Xin Zhao Takeo Minamikawa Ting Li Zheng Zheng Takeshi Yasui Dual terahertz comb spectroscopy with a single free-running fibre laser
description	Abstract Dual terahertz (THz) comb spectroscopy enables high spectral resolution, high spectral accuracy, and broad spectral coverage; however, the requirement for dual stabilized femtosecond lasers hampers its versatility. We here report the first demonstration of dual THz comb spectroscopy using a single free-running fibre laser. By tuning the cavity-loss-dependent gain profile with an intracavity Lyot filter together with precise management of the cavity length and dispersion, dual-wavelength comb light beams with slightly detuned repetition frequencies are generated in a single laser cavity. Due to sharing of the same cavity, such comb light beams suffer from common-mode fluctuation of the repetition frequency, and hence the corresponding frequency difference between them is passively stable around a few hundred hertz within millihertz fluctuation. While greatly reducing the size, complexity, and cost of the laser source by use of a single free-running fibre laser, the dual THz comb spectroscopy system maintains a spectral bandwidth and dynamic range of spectral power comparable to a system equipped with dual stabilized fibre lasers, and can be effectively applied to high-precision spectroscopy of acetonitrile gas at atmospheric pressure. The demonstrated results indicate that this system is an attractive solution for practical applications of THz spectroscopy and other applications.
format	article
author	Guoqing Hu Tatsuya Mizuguchi Ryo Oe Kazuki Nitta Xin Zhao Takeo Minamikawa Ting Li Zheng Zheng Takeshi Yasui
author_facet	Guoqing Hu Tatsuya Mizuguchi Ryo Oe Kazuki Nitta Xin Zhao Takeo Minamikawa Ting Li Zheng Zheng Takeshi Yasui
author_sort	Guoqing Hu
title	Dual terahertz comb spectroscopy with a single free-running fibre laser
title_short	Dual terahertz comb spectroscopy with a single free-running fibre laser
title_full	Dual terahertz comb spectroscopy with a single free-running fibre laser
title_fullStr	Dual terahertz comb spectroscopy with a single free-running fibre laser
title_full_unstemmed	Dual terahertz comb spectroscopy with a single free-running fibre laser
title_sort	dual terahertz comb spectroscopy with a single free-running fibre laser
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/f328ec574ec24db0925a3171040ca9c7
work_keys_str_mv	AT guoqinghu dualterahertzcombspectroscopywithasinglefreerunningfibrelaser AT tatsuyamizuguchi dualterahertzcombspectroscopywithasinglefreerunningfibrelaser AT ryooe dualterahertzcombspectroscopywithasinglefreerunningfibrelaser AT kazukinitta dualterahertzcombspectroscopywithasinglefreerunningfibrelaser AT xinzhao dualterahertzcombspectroscopywithasinglefreerunningfibrelaser AT takeominamikawa dualterahertzcombspectroscopywithasinglefreerunningfibrelaser AT tingli dualterahertzcombspectroscopywithasinglefreerunningfibrelaser AT zhengzheng dualterahertzcombspectroscopywithasinglefreerunningfibrelaser AT takeshiyasui dualterahertzcombspectroscopywithasinglefreerunningfibrelaser
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Dual terahertz comb spectroscopy with a single free-running fibre laser

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