Large and Ultrafast Third-Order Nonlinear Optical Properties of Ge-S Based Chalcogenide Glasses  

作　　者：褚赛赛 王树峰 陶海征 王振伟 杨宏 林常规 龚旗煌 赵修建 

机构地区：[1]State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beljing 100871 [2]Key Laboratory of Silicate Materials Science and Engineering (Ministry of Education), Wuhan University of Technology, Wuhan 430070 [3]Key Laboratory of Advanced Materials and Rheological Properties (Ministry of Education ), Xiangtan University, Xiangtan 4111005

出　　处：《Chinese Physics Letters》2007年第3期727-729,共3页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 10504001, 10521002 and 50125205, the National Key Basic Research Programme of Chin under Grant No 2006CB806007, the 0pen Project Programme of Key Laboratory of Advanced Materials and Rheological Properties （Ministry of Education）, Xiangtan University, China.

摘　　要：We report ultrafast third-order nonlinear optical （NLO） properties of several chalcogenide glasses GeSx （x = 1.8, 2.0, 2.5） measured by femtosecond time-resolved optical Kerr gate technique at 82Ohm. The third-order nonlinear susceptibility of GeS1.8 glass is determined to be as large as 1.41 ×10^-12 esu, which is the maximum value of the third order nonlinear susceptibility Х^（3） for the three compositions investigated. The symmetric Gauss profiles of optical Kerr signals reveal the nature of ultrafast nonlinear response of these samples, which are originated from the ultrafast polarization of the electron clouds. By detailed microstructural analysis of these glasses based on the chain-crossing model （CCM） and the random-covalent-network model （RCNM）, it can be concluded that Х^（3） value of GeSx glasses can be enhanced greatly by S-S covalent bonds or S3 Ge-GeS3 ethane-l＆e units.We report ultrafast third-order nonlinear optical （NLO） properties of several chalcogenide glasses GeSx （x = 1.8, 2.0, 2.5） measured by femtosecond time-resolved optical Kerr gate technique at 82Ohm. The third-order nonlinear susceptibility of GeS1.8 glass is determined to be as large as 1.41 ×10^-12 esu, which is the maximum value of the third order nonlinear susceptibility Х^（3） for the three compositions investigated. The symmetric Gauss profiles of optical Kerr signals reveal the nature of ultrafast nonlinear response of these samples, which are originated from the ultrafast polarization of the electron clouds. By detailed microstructural analysis of these glasses based on the chain-crossing model （CCM） and the random-covalent-network model （RCNM）, it can be concluded that Х^（3） value of GeSx glasses can be enhanced greatly by S-S covalent bonds or S3 Ge-GeS3 ethane-l＆e units.

关 键 词：RAMAN-SCATTERING SYSTEM 

分 类 号：O43[机械工程—光学工程]