Third- and second-order optical nonlinearity of Ge–Ga–S–PbI2 chalcohalide glasses

✍ Scribed by Haitao Guo; Haizheng Tao; Shaoxuan Gu; Xiaolin Zheng; Yanbo Zhai; Saisai Chu; Xiujian Zhao; Shufeng Wang; Qihuang Gong

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 300 KB
• Volume: 180
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2006.10.012

✦ Synopsis

Two series of metal iodide doped chalcohalide glasses (100À2x)GeS 2 Á xGa 2 S 3 Á xPbI 2 (0pxp20) and (100Àx)(0.8GeS 2 Á 0.2Ga 2 S 3 ) Á xPbI 2 (0pxp15) were prepared and characterized. The microstructure of these glasses has been studied by Raman scattering spectra. Utilizing femtosecond time-resolved optical Kerr effect (OKE) technique at the wavelength of 820 nm, a largest third-order nonlinearity w (3) of 2.07 Â 10 À13 esu was obtained for the 90GeS 2 Á 5Ga 2 S 3 Á 5PbI 2 glass, and it decreases with the addition of PbI 2 in both two series. After thermally poled, second-harmonic generation (SHG) has been observed in these glasses according to Maker fringe method and a large second-order nonlinearity w (2) as well as 4 pm/V was obtained for the 70GeS 2 Á 15Ga 2 S 3 Á 15PbI 2 glass. The variations of w (2) and w (3) on glass composition are ascribed to the evolution of micro-structural units in glass. These novel chalcohalide glasses would be expected to be the promising candidate materials for nonlinear optical devices.