中国物理B ›› 2024, Vol. 33 ›› Issue (5): 54206-054206.doi: 10.1088/1674-1056/ad225f

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

Wenjie Fan(范文杰)1, Wenyao Liu(刘文耀)1,2,†, Ziwen Pan(潘梓文)1, Rong Wang(王蓉)1, Lai Liu(刘来)1,2, Enbo Xing(邢恩博)1,2, Yanru Zhou(周彦汝)1,2, Jun Tang(唐军)1,2, and Jun Liu(刘俊)1,2   

  1. 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
  • 收稿日期:2023-12-05 修回日期:2024-01-08 接受日期:2024-01-25 出版日期:2024-05-20 发布日期:2024-05-20
  • 通讯作者: Wenyao Liu E-mail:liuwenyao@nuc.edu.cn
  • 基金资助:
    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), and Shanxi Province Key Laboratory of Quantum Sensing and Precision Measurement (Grant No. 201905D121001).

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

Wenjie Fan(范文杰)1, Wenyao Liu(刘文耀)1,2,†, Ziwen Pan(潘梓文)1, Rong Wang(王蓉)1, Lai Liu(刘来)1,2, Enbo Xing(邢恩博)1,2, Yanru Zhou(周彦汝)1,2, Jun Tang(唐军)1,2, and Jun Liu(刘俊)1,2   

  1. 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
  • Received:2023-12-05 Revised:2024-01-08 Accepted:2024-01-25 Online:2024-05-20 Published:2024-05-20
  • Contact: Wenyao Liu E-mail:liuwenyao@nuc.edu.cn
  • Supported by:
    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), and Shanxi Province Key Laboratory of Quantum Sensing and Precision Measurement (Grant No. 201905D121001).

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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

Abstract: 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.

Key words: optical microcavity, thermo-optic locking, thermal nonlinearity effect

中图分类号:  (Microcavity and microdisk lasers)

  • 42.55.Sa
42.65.Sf (Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics) 42.60.Da (Resonators, cavities, amplifiers, arrays, and rings)