| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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A novel dual-channel thermo-optic locking method for the whisperinggallery mode microresonator |
| Wenjie Fan(范文杰)1, Wenyao Liu(刘文耀)1,2,†, ZiwenPan(潘梓文)1, Rong Wang(王蓉)1, Lai Liu(刘来)1,2, EnboXing(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 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 |
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Abstract Mode locking can be effectively achieved by using the thermo-optic effects inthe whispering gallery mode (WGM) optical microcavity, without the help ofexternal equipment. Therefore, it has the advantages of small size, lowintegration costs, and self-locking, which shows great potential forapplication. However, the conventional single-channel microcavitythermal-locking method that relies solely on internal thermal balance willinevitably be disturbed by the external environment. This limitation affectsthe locking time and stability. Therefore, in this paper, we propose a newmethod for closed-loop thermal locking of a dual-channel microcavity. Thethermal locking of the signal laser and the thermal regulation of thecontrol laser are carried out respectively by synchronously drawing adual-path tapered fiber. The theoretical model of the thermal dynamics ofthe dual-channel microcavity system is established, and the influence of thecontrol-laser power on the thermal locking of the signal laser is confirmed.The deviation between the locking voltage of the signal laser and the setpoint value is used as a closed-loop feedback parameter to achieve long-termand highly stable mode locking of the signal laser. The results show that inthe 2.63 h thermal-locking test, the locking stability is an order ofmagnitude higher than that of the single tapered fiber. This solutionaddresses the issue of thermal locking being disrupted by the externalenvironment, and offers new possibilities for important applications such asspectroscopy and micro-optical sensor devices.
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Received: 05 December 2023
Revised: 08 January 2024
Accepted manuscript online:
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PACS:
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42.55.Sa
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(Microcavity and microdisk lasers)
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78.20.N-
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42.65.Sf
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(Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics)
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42.60.Da
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(Resonators, cavities, amplifiers, arrays, and rings)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2022YFB3203400),the National Natural Science Foundation of China (GrantNos. U21A20141, 62273314, and 51821003), the Fundamental Research Program of Shanxi Province (GrantNo. 202303021223001), and Shanxi Province Key Laboratory of Quantum Sensing and Precision Measurement (GrantNo. 201905D121001). |
Corresponding Authors:
Wenyao Liu,E-mail:liuwenyao@nuc.edu.cn
E-mail: liuwenyao@nuc.edu.cn
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Cite this article:
Wenjie Fan(范文杰), Wenyao Liu(刘文耀), ZiwenPan(潘梓文), Rong Wang(王蓉), Lai Liu(刘来), EnboXing(邢恩博), Yanru Zhou(周彦汝), Jun Tang(唐军), and Jun Liu(刘俊) A novel dual-channel thermo-optic locking method for the whisperinggallery mode microresonator 2024 Chin. Phys. B 33 054206
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