| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Raman lasing and other nonlinear effects based on ultrahigh-Q CaF2 optical resonator |
| Tong Xing(邢彤), Enbo Xing(邢恩博)†, Tao Jia(贾涛), Jianglong Li(李江龙), Jiamin Rong(戎佳敏), Yanru Zhou(周彦汝), Wenyao Liu(刘文耀), Jun Tang(唐军)‡, and Jun Liu(刘俊) |
| Key Laboratory of Electronic Testing Technology, School of Instrument and Electronics, North University of China, Taiyuan 030051, China |
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Abstract The calcium fluoride (CaF2) whispering gallery mode crystalline resonator is an excellent platform for nonlinear optical applications because of the decreasing in threshold caused by ultrahigh quality (Q) factor. In this paper, we achieved the observation of Raman lasing, first-order Raman comb, and second-order Raman lasing in a CaF2 disk resonator with a diameter of 4.96 mm and an ultrahigh-Q of 8.43× 108 at 1550-nm wavelength. We also observed thermal effects in CaF2 disk resonator, and the threshold of thermo-optical oscillation is approximately coincident with Raman lasing, since the intracavity power increases rapidly when the power reaches the threshold, and higher input pump power results in longer thermal drift and higher Raman emission power. With a further increase in pump power, the optical frequency combs range is from 1520 nm to 1650 nm, with a wavelength interval of 4× m FSR. It is a promising candidate for optical communication, biological environment monitoring, spectral analysis, and microwave signal sources.
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Received: 10 May 2022
Revised: 18 July 2022
Accepted manuscript online:
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PACS:
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42.55.Ye
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(Raman lasers)
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42.60.Da
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(Resonators, cavities, amplifiers, arrays, and rings)
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42.65.-k
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(Nonlinear optics)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51727808, 51922009, 52005457, and 62004179) and the Fund from the Key Laboratory of Quantum Sensing and Precision Measurement of Shanxi Province, China (Grant No. 201905D121001). |
Corresponding Authors:
Enbo Xing, Jun Tang
E-mail: xiaoxing1228@126.com;tangjun@nuc.edu.cn
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Cite this article:
Tong Xing(邢彤), Enbo Xing(邢恩博), Tao Jia(贾涛), Jianglong Li(李江龙), Jiamin Rong(戎佳敏), Yanru Zhou(周彦汝), Wenyao Liu(刘文耀), Jun Tang(唐军), and Jun Liu(刘俊) Raman lasing and other nonlinear effects based on ultrahigh-Q CaF2 optical resonator 2022 Chin. Phys. B 31 104204
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