Hundredfold increase of stimulated Brillouin-scattering bandwidth in whispering-gallery mode resonators  

作　　者：GUOPING LIN JINGYI TIAN TANG SUN QINGHAI SONG YANNE K.CHEMBO 

机构地区：[1]Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System,School of Science,Harbin Institute of Technology,Shenzhen 518055,China [2]Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems,Shenzhen 518055,China [3]Department of Electrical and Computer Engineering&Institute for Research in Electronics and Applied Physics(IREAP),University of Maryland,College Park,Maryland 20742,USA

出　　处：《Photonics Research》2023年第6期917-924,共8页光子学研究（英文版）

基　　金：Science,Technology and Innovation Commission of Shenzhen Municipality(JCYJ20200109112805990);National Natural Science Foundation of China(62275064)。

摘　　要：Backward stimulated Brillouin scattering(SBS)is widely exploited for various applications in optics and optoelectronics.It typically features a narrow gain bandwidth of a few tens of megahertz in fluoride crystals.Here we report a hundredfold increase of SBS bandwidth in whispering-gallery mode resonators.The crystalline orientation results in a large variation of the acoustic phase velocity upon propagation along the periphery,from which a broad Brillouin gain is formed.Over 2.5 GHz wide Brillouin gain profile is theoretically found and experimentally validated.SBS phenomena with Brillouin shift frequencies ranging from 11.73 to 14.47 GHz in ultrahigh Q Z-cut magnesium fluoride cavities pumped at the telecommunication wavelength are demonstrated.Furthermore,the Brillouin-Kerr comb in this device is demonstrated.Over 400 comb lines spanning across a spectral window of 120 nm are observed.Our finding paves a new way for tailoring and harnessing the Brillouin gain in crystals.

关 键 词：SCATTERING PUMPED BRILLOUIN 

分 类 号：TN751.2[电子电信—电路与系统]