Finesse measurement for high-power optical enhancement cavity

作     者：陆心怡 柳兴 田其立 王焕 汪嘉俊 颜立新 Xin-Yi Lu;Xing Liu;Qi-Li Tian;Huan Wang;Jia-Jun Wang;Li-Xin Yan

作者机构：Department of Engineering PhysicsTsinghua UniversityBeijing 100084China Key Laboratory of Particle&Radiation ImagingMinistry of EducationBeijing 100084China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2024年第33卷第1期

页      面：414-421页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：Project supported by National Key Research and Development Program of China (Grant No.2022YFA1603403) 

主　　题：optical enhancement cavity finesse measurement cavity ring-down ringing effect 

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.