Designing a Long Optical Path Direct-Injection-Integrated Cavity for Laser Absorption Spectroscopy
Trace gas measurement has a wide range of applications needed in industrial, medical, and environmental protection. With the evolution of time, the demand for real-time, sensitivity, and accuracy of gas detection has been increasingly heightened. Off-axis integrated cavity output spectroscopy (OA-IC...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-12-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/11/1/36 |
| _version_ | 1797342702333853696 |
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| author | Quyouyang Gao Yuquan Zheng Long Wang Chengliang Li Jialun Zhang Hao Wu Yanxue Han Shuo Wang |
| author_facet | Quyouyang Gao Yuquan Zheng Long Wang Chengliang Li Jialun Zhang Hao Wu Yanxue Han Shuo Wang |
| author_sort | Quyouyang Gao |
| collection | DOAJ |
| description | Trace gas measurement has a wide range of applications needed in industrial, medical, and environmental protection. With the evolution of time, the demand for real-time, sensitivity, and accuracy of gas detection has been increasingly heightened. Off-axis integrated cavity output spectroscopy (OA-ICOS) is an effective method for the high-sensitivity detection of trace gases. It uses an integrated cavity with two highly reflective mirrors to provide a long optical path, which guarantees its high sensitivity. However, as the reflectivity of the mirrors increases, the intensity of the output light decreases, and the signal-to-noise ratio decreases. This contradiction makes it difficult to achieve a long optical path and a high signal-to-noise ratio together. To combat this issue, this paper proposes a type of integrated cavity using a direct-injection method. This structure, under equivalent mirror conditions, can maintain an effective absorption optical path very close to the original off-axis integrated cavity while increasing the output light intensity hundreds of times. This enhancement increases the sensitivity of OA-ICOS. |
| first_indexed | 2024-03-08T10:37:07Z |
| format | Article |
| id | doaj.art-190dcd9e27da462bb5abb398d0390078 |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-08T10:37:07Z |
| publishDate | 2023-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj.art-190dcd9e27da462bb5abb398d03900782024-01-26T18:09:41ZengMDPI AGPhotonics2304-67322023-12-011113610.3390/photonics11010036Designing a Long Optical Path Direct-Injection-Integrated Cavity for Laser Absorption SpectroscopyQuyouyang Gao0Yuquan Zheng1Long Wang2Chengliang Li3Jialun Zhang4Hao Wu5Yanxue Han6Shuo Wang7Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaChangchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaChangchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaChangchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaChangchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaChangchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaChangchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaChangchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaTrace gas measurement has a wide range of applications needed in industrial, medical, and environmental protection. With the evolution of time, the demand for real-time, sensitivity, and accuracy of gas detection has been increasingly heightened. Off-axis integrated cavity output spectroscopy (OA-ICOS) is an effective method for the high-sensitivity detection of trace gases. It uses an integrated cavity with two highly reflective mirrors to provide a long optical path, which guarantees its high sensitivity. However, as the reflectivity of the mirrors increases, the intensity of the output light decreases, and the signal-to-noise ratio decreases. This contradiction makes it difficult to achieve a long optical path and a high signal-to-noise ratio together. To combat this issue, this paper proposes a type of integrated cavity using a direct-injection method. This structure, under equivalent mirror conditions, can maintain an effective absorption optical path very close to the original off-axis integrated cavity while increasing the output light intensity hundreds of times. This enhancement increases the sensitivity of OA-ICOS.https://www.mdpi.com/2304-6732/11/1/36off-axis integrated cavity output spectroscopylong optical pathsignal-to-noise ratiosensitivity |
| spellingShingle | Quyouyang Gao Yuquan Zheng Long Wang Chengliang Li Jialun Zhang Hao Wu Yanxue Han Shuo Wang Designing a Long Optical Path Direct-Injection-Integrated Cavity for Laser Absorption Spectroscopy Photonics off-axis integrated cavity output spectroscopy long optical path signal-to-noise ratio sensitivity |
| title | Designing a Long Optical Path Direct-Injection-Integrated Cavity for Laser Absorption Spectroscopy |
| title_full | Designing a Long Optical Path Direct-Injection-Integrated Cavity for Laser Absorption Spectroscopy |
| title_fullStr | Designing a Long Optical Path Direct-Injection-Integrated Cavity for Laser Absorption Spectroscopy |
| title_full_unstemmed | Designing a Long Optical Path Direct-Injection-Integrated Cavity for Laser Absorption Spectroscopy |
| title_short | Designing a Long Optical Path Direct-Injection-Integrated Cavity for Laser Absorption Spectroscopy |
| title_sort | designing a long optical path direct injection integrated cavity for laser absorption spectroscopy |
| topic | off-axis integrated cavity output spectroscopy long optical path signal-to-noise ratio sensitivity |
| url | https://www.mdpi.com/2304-6732/11/1/36 |
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