High efficiency of Brillouin scattering behavior in single-mode Ge–As–Se–Te fibers at 2μm  

作　　者：付悦 戴世勋 徐路路 方耀俊 王莹莹 焦凯 王训四 Yue Fu;Shi-Xun Dai;Lu-Lu Xu;Yao-Jun Fang;Ying-Ying Wang;Kai Jiao;Xun-Si Wang(Laboratory of Infrared Materials and Devices,The Research Institute of Advanced Technologies,Ningbo University,Ningbo 315211,China;Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province,Ningbo 315211,China;Engineering Research Center for Advanced Infrared Photoelectric Materials and Devices of Zhejiang Province,Ningbo 315211,China;Faculty of Electrical Engineering and Computer Science,Ningbo University,Ningbo 315211,China)

机构地区：[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

出　　处：《Chinese Physics B》2023年第5期449-456,共8页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.61875094 and 62090064);the China Postdoctoral Science Foundation(Grant No.2018M642386);the K.C.Wong Magna Fund in Ningbo University。

摘　　要：The Brillouin characteristics of step-index Ge–As–Se–Te(GAST)fibers at 2μm are designed and simulated on the basis of optical and acoustic properties.The refractive indexes of Ge_(20)As_(20)Se_(45)Te_(15)glass and Ge_(20)As_(20)Se_(43)Te_(17)glass serving as fiber core and cladding are 3.20 and 3.18 at 2μm,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 m^(-1)·W^(-1),and the Brillouin threshold power is 66 m W when the core diameter of the 2-m-long GAST fiber is 4μm 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 3.81×10^(-9)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.

关 键 词：stimulated Brillouin scattering chalcogenide fiber nonlinear effect optical–acoustic coupling 

分 类 号：TN253[电子电信—物理电子学] TN248