High efficiency of Brillouin scattering behavior in single-mode Ge-As-Se-Te fibers at 2 μm
Yue Fu(付悦)1,2,3, Shi-Xun Dai(戴世勋)1,2,3,†, Lu-Lu Xu(徐路路)1,2,3, Yao-Jun Fang(方耀俊)4, Ying-Ying Wang(王莹莹)1,2,3, Kai Jiao(焦凯)1,2,3, and Xun-Si Wang(王训四)1,2,3
1 Laboratory of Infrared Materials and Devices, The Research Institute of Advanced Technologies, Ningbo University, Ningbo 315211, China; 2 Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province, Ningbo 315211, China; 3 Engineering Research Center for Advanced Infrared Photoelectric Materials and Devices of Zhejiang Province, Ningbo 315211, China; 4 Faculty of Electrical Engineering and Computer Science, Ningbo University, Ningbo 315211, China
Abstract The Brillouin characteristics of step-index Ge-As-Se-Te (GAST) fibers at 2 μm are designed and simulated on the basis of optical and acoustic properties. The refractive indexes of GeAsSeTe glass and GeAsSeTe glass serving as fiber core and cladding are 3.20 and 3.18 at 2 μm, and their acoustic velocities are 2200 m/s and 2300 m/s, respectively. Numerical results indicate that the stimulated Brillouin scattering (SBS) efficiency is 248 mW, and the Brillouin threshold power is 66 mW when the core diameter of the 2-m-long GAST fiber is 4 μm at 2-μm wavelength. The optic-acoustic coupling factor, the Brillouin frequency shift, and the Brillouin gain coefficient are 0.98, 7.02 GHz, and 3.81 m/W, respectively. The SBS effect of GAST fibers simulated for the first time provides a new promising approach to selecting gain medium based on 2-μm-wavelength fiber laser.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61875094 and 62090064), the China Postdoctoral Science Foundation (Grant No. 2018M642386), and the K. C. Wong Magna Fund in Ningbo University.
Corresponding Authors:
Shi-Xun Dai
E-mail: daishixun@nbu.edu.cn
Cite this article:
Yue Fu(付悦), Shi-Xun Dai(戴世勋), Lu-Lu Xu(徐路路), Yao-Jun Fang(方耀俊), Ying-Ying Wang(王莹莹), Kai Jiao(焦凯), and Xun-Si Wang(王训四) High efficiency of Brillouin scattering behavior in single-mode Ge-As-Se-Te fibers at 2 μm 2023 Chin. Phys. B 32 054206
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