Optical limiting of niobic tellurite glass induced by self-trapped exciton absorption of the AgCl nanocrystal dopant  

作　　者：ZHAO zhenYu LIN Jian JIA TianQin SUN ZhenRong WANG ZuGeng 

机构地区：[1]State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University,Shanghai 200062, China [2]School of Materials Science and Engineering, Tongji University, Shanghai 200092, China

出　　处：《Chinese Science Bulletin》2009年第7期1164-1168,共5页

基　　金：Supported by Shanghai Leading Academic Discipline Project (Grant No. B408);National Basic Research Program of China (Grant Nos. 2006CB806006, 2006CB921105);Program for Changjiang Scholars and Innovative Research Team in University, Doctoral Program of High Education (Grant No. 20050269011);Project sponsored by Shanghai Science and Technology Committee (Grant Nos. 06DJ14008, 07dz22025, 06QH14003)

摘　　要：Niobic tellurite glass doped by silver chloride nanocrystal was prepared with the melting-quenching and heat treatment method, and the self-trapped exciton absorption band of the silver chloride nanocrystal was observed at 532 nm in the UV-visible absorption spectrum. The glass structure characteristics were investigated by Raman spectroscopy, and the mechanism of self-trapped exciton was analyzed by Jahn-Teller model. Its optical limiting was measured with 532 nm picosecond laser pulses, and the corresponding nonlinear absorption coefficient was measured with open-aperture Z-scan. The experimental results showed that optical limiting at 532 nm was attributed to free carrier absorption between the self-trapped state and the continuum band.Niobic tellurite glass doped by silver chloride nanocrystal was prepared with the melting-quenching and heat treatment method, and the self-trapped exciton absorption band of the silver chloride nanocrystal was observed at 532 nm in the UV-visible absorption spectrum. The glass structure chara-cteristics were investigated by Raman spectroscopy, and the mechanism of self-trapped exciton was analyzed by Jahn-Teller model. Its optical limiting was measured with 532 nm picosecond laser pulses, and the corresponding nonlinear absorption coefficient was measured with open-aperture Z-scan. The experimental results showed that optical limiting at 532 nm was attributed to free carrier absorption between the self-trapped state and the continuum band.

关 键 词：碲酸盐玻璃 纳米掺杂 光限幅 铌掺杂 激子吸收 紫外可见吸收光谱 非线性吸收系数 自由载流子吸收 

分 类 号：O437[机械工程—光学工程] TQ171[理学—光学]