A novel dual-channel thermo-optic locking method for the whispering gallery mode microresonator  

作　　者：范文杰 刘文耀 潘梓文 王蓉 刘来 邢恩博 周彦汝 唐军 刘俊 Wenjie Fan;Wenyao Liu;Ziwen Pan;Rong Wang;Lai Liu;Enbo Xing;Yanru Zhou;Jun Tang;Jun Liu(State Key Laboratory of Dynamic Measurement Technology,North University of China,Taiyuan 030051,China;Shanxi Province Key Laboratory of Quantum Sensing and Precision Measurement,North University of China,Taiyuan 030051,China)

机构地区：[1]State Key Laboratory of Dynamic Measurement Technology,North University of China,Taiyuan 030051,China [2]Shanxi Province Key Laboratory of Quantum Sensing and Precision Measurement,North University of China,Taiyuan 030051,China

出　　处：《Chinese Physics B》2024年第5期438-444,共7页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2022YFB3203400);the National Natural Science Foundation of China(Grant Nos.U21A20141,62273314,and 51821003);the Fundamental Research Program of Shanxi Province(Grant No.202303021223001);Shanxi Province Key Laboratory of Quantum Sensing and Precision Measurement(Grant No.201905D121001)。

摘　　要：Mode locking can be effectively achieved by using the thermo-optic effects in the whispering gallery mode(WGM)optical microcavity,without the help of external equipment.Therefore,it has the advantages of small size,low integration costs,and self-locking,which shows great potential for application.However,the conventional single-channel microcavity thermal-locking method that relies solely on internal thermal balance will inevitably be disturbed by the external environment.This limitation affects the locking time and stability.Therefore,in this paper,we propose a new method for closed-loop thermal locking of a dual-channel microcavity.The thermal locking of the signal laser and the thermal regulation of the control laser are carried out respectively by synchronously drawing a dual-path tapered fiber.The theoretical model of the thermal dynamics of the dual-channel microcavity system is established,and the influence of the control-laser power on the thermal locking of the signal laser is confirmed.The deviation between the locking voltage of the signal laser and the set point value is used as a closed-loop feedback parameter to achieve long-term and highly stable mode locking of the signal laser.The results show that in the 2.63 h thermal-locking test,the locking stability is an order of magnitude higher than that of the single tapered fiber.This solution addresses the issue of thermal locking being disrupted by the external environment,and offers new possibilities for important applications such as spectroscopy and micro-optical sensor devices.

关 键 词：optical microcavity thermo-optic locking thermal nonlinearity effect 

分 类 号：TN751.2[电子电信—电路与系统] O43[机械工程—光学工程]