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Large and Ultrafast Third-Order Nonlinear Optical Properties of Ge-S Based Chalcogenide Glasses |
| CHU Sai-Sai1;WANG Shu-Feng1;TAO Hai-Zheng2;WANG Zhen-Wei1;YANG Hong1;LIN Chang-Gui3;GONG Qi-Huang1;ZHAO Xiu-Jian2 |
| 1State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 1008712Key Laboratory of Silicate Materials Science and Engineering (Ministry of Education), Wuhan University of Technology, Wuhan 4300703Key Laboratory of Advanced Materials and Rheological Properties (Ministry of Education), Xiangtan University, Xiangtan 4111005 |
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| Cite this article: |
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CHU Sai-Sai, WANG Shu-Feng, TAO Hai-Zheng et al 2007 Chin. Phys. Lett. 24 727-729 |
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Abstract 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 820nm. The third-order nonlinear susceptibility of GeS 1.8 glass is determined to be as large as 1.41×10-12 esu, which is the maximum value of the third order nonlinear susceptibility
χ(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 χ(3) value of GeSx glasses can be enhanced greatly by S--S covalent bonds or S3Ge--GeS3 ethane-like units.
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| Keywords:
42.65.An
61.43.Fs
42.65.-k
42.65.Re
78.47.+p
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Received: 29 September 2006
Published: 08 February 2007
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