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...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2018-07-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-018-29403-9 |
| _version_ | 1818996109194821632 |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-20T21:24:30Z |
| format | Article |
| id | doaj.art-f328ec574ec24db0925a3171040ca9c7 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-20T21:24:30Z |
| publishDate | 2018-07-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-f328ec574ec24db0925a3171040ca9c72022-12-21T19:26:12ZengNature PortfolioScientific Reports2045-23222018-07-01811910.1038/s41598-018-29403-9Dual terahertz comb spectroscopy with a single free-running fibre laserGuoqing Hu0Tatsuya Mizuguchi1Ryo Oe2Kazuki Nitta3Xin Zhao4Takeo Minamikawa5Ting Li6Zheng Zheng7Takeshi Yasui8Graduate School of Advanced Technology and Science, Tokushima UniversityGraduate School of Advanced Technology and Science, Tokushima UniversityGraduate School of Advanced Technology and Science, Tokushima UniversityGraduate School of Advanced Technology and Science, Tokushima UniversitySchool of Electronic and Information Engineering, Beihang UniversityJST, ERATO, MINOSHIMA Intelligent Optical Synthesizer ProjectSchool of Electronic and Information Engineering, Beihang UniversitySchool of Electronic and Information Engineering, Beihang UniversityJST, ERATO, MINOSHIMA Intelligent Optical Synthesizer ProjectAbstract 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.https://doi.org/10.1038/s41598-018-29403-9 |
| spellingShingle | 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 Scientific Reports |
| title | 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_short | Dual terahertz comb spectroscopy with a single free-running fibre laser |
| title_sort | dual terahertz comb spectroscopy with a single free running fibre laser |
| url | https://doi.org/10.1038/s41598-018-29403-9 |
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