中国物理B ›› 2024, Vol. 33 ›› Issue (1): 14205-14205.doi: 10.1088/1674-1056/acd8ad

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Finesse measurement for high-power optical enhancement cavity

Xin-Yi Lu(陆心怡)1,2, Xing Liu(柳兴)1,2,†, Qi-Li Tian(田其立)1,2, Huan Wang(王焕)1,2, Jia-Jun Wang(汪嘉俊)1,2, and Li-Xin Yan(颜立新)1,2,‡   

  1. 1 Department of Engineering Physics, Tsinghua University, Beijing 100084, China;
    2 Key Laboratory of Particle & Radiation Imaging(Tsinghua University), Ministry of Education, Beijing 100084, China
  • 收稿日期:2023-03-02 修回日期:2023-05-23 接受日期:2023-05-25 出版日期:2023-12-13 发布日期:2023-12-13
  • 通讯作者: Xing Liu, Li-Xin Yan E-mail:xingliu@mail.tsinghua.edu.cn;yanlx@mail.tsinghua.edu.cn
  • 基金资助:
    Project supported by National Key Research and Development Program of China (Grant No. 2022YFA1603403).

Finesse measurement for high-power optical enhancement cavity

Xin-Yi Lu(陆心怡)1,2, Xing Liu(柳兴)1,2,†, Qi-Li Tian(田其立)1,2, Huan Wang(王焕)1,2, Jia-Jun Wang(汪嘉俊)1,2, and Li-Xin Yan(颜立新)1,2,‡   

  1. 1 Department of Engineering Physics, Tsinghua University, Beijing 100084, China;
    2 Key Laboratory of Particle & Radiation Imaging(Tsinghua University), Ministry of Education, Beijing 100084, China
  • Received:2023-03-02 Revised:2023-05-23 Accepted:2023-05-25 Online:2023-12-13 Published:2023-12-13
  • Contact: Xing Liu, Li-Xin Yan E-mail:xingliu@mail.tsinghua.edu.cn;yanlx@mail.tsinghua.edu.cn
  • Supported by:
    Project supported by National Key Research and Development Program of China (Grant No. 2022YFA1603403).

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摘要： Finesse is a critical parameter for describing the characteristics of an optical enhancement cavity (OEC). This paper first presents a review of finesse measurement techniques, including a comparative analysis of the advantages, disadvantages, and potential limitations of several main methods from both theoretical and practical perspectives. A variant of the existing method called the free spectral range (FSR) modulation method is proposed and compared with three other finesse measurement methods, i.e., the fast-switching cavity ring-down (CRD) method, the rapidly swept-frequency (SF) CRD method, and the ringing effect method. A high-power OEC platform with a high finesse of approximately 16000 is built and measured with the four methods. The performance of these methods is compared, and the results show that the FSR modulation method and the fast-switching CRD method are more suitable and accurate than the other two methods for high-finesse OEC measurements. The CRD method and the ringing effect method can be implemented in open loop using simple equipment and are easy to perform. Additionally, recommendations for selecting finesse measurement methods under different conditions are proposed, which benefit the development of OEC and its applications.

关键词: optical enhancement cavity, finesse measurement, cavity ring-down, ringing effect

Abstract: Finesse is a critical parameter for describing the characteristics of an optical enhancement cavity (OEC). This paper first presents a review of finesse measurement techniques, including a comparative analysis of the advantages, disadvantages, and potential limitations of several main methods from both theoretical and practical perspectives. A variant of the existing method called the free spectral range (FSR) modulation method is proposed and compared with three other finesse measurement methods, i.e., the fast-switching cavity ring-down (CRD) method, the rapidly swept-frequency (SF) CRD method, and the ringing effect method. A high-power OEC platform with a high finesse of approximately 16000 is built and measured with the four methods. The performance of these methods is compared, and the results show that the FSR modulation method and the fast-switching CRD method are more suitable and accurate than the other two methods for high-finesse OEC measurements. The CRD method and the ringing effect method can be implemented in open loop using simple equipment and are easy to perform. Additionally, recommendations for selecting finesse measurement methods under different conditions are proposed, which benefit the development of OEC and its applications.

Key words: optical enhancement cavity, finesse measurement, cavity ring-down, ringing effect

中图分类号:  (Resonators, cavities, amplifiers, arrays, and rings)

  • 42.60.Da
42.60.-v (Laser optical systems: design and operation) 42.60.Fc (Modulation, tuning, and mode locking)