Study on the structure dependent ultrafast third-order optical nonlinearity of GeS2–In2S3 chalcogenide glasses

✍ Scribed by Guoping Dong; Haizheng Tao; Saisai Chu; Shufeng Wang; Xiujian Zhao; Qihuang Gong; Xiudi Xiao; Changgui Lin

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 202 KB
• Volume: 270
• Category: Article
• ISSN: 0030-4018
• DOI: 10.1016/j.optcom.2006.08.048

✦ Synopsis

The results of the femtosecond time-resolved optical Kerr at 820 nm in GeS 2 -In 2 S 3 chalcogenide glasses indicate that the response time in GeS 2 -In 2 S 3 glasses is subpicosecond, which is predominantly due to the distortion of the electron cloud. The value of v (3) in 0.95GeS 2 -0.05In 2 S 3 glass is also as large as 2.7 • 10 À13 esu, and it reduces with the addition of In 2 S 3 , which may be ascribed to the microstructure evolution of GeS 2 -In 2 S 3 glasses. It is deduced that the intrinsic [Ge(In)S 4 ] tetrahedral structure units that possess the high hyperpolarizability may do great contribution to the enhancement of third-order optical nonlinearity while [S 3 Ge-GeS 3 ] ethane-like molecular units make no considerable contribution to that in femtosecond time scale. These GeS 2 -In 2 S 3 and GeS 2 -In 2 S 3 -based chalcogenide glasses would be expected to be the promising materials for all-optical switching devices.