| Ce:BaTiO3晶体中两个深陷阱能级引起的光折变光栅暗衰减特性 |
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| 引用本文： | 张明,徐英,洪治. Ce:BaTiO3晶体中两个深陷阱能级引起的光折变光栅暗衰减特性[J]. 中国物理, 2005, 14(5): 995-998 |
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| 作者姓名： | 张明 徐英 洪治 |
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| 作者单位： | Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, 310027, China;College of Information Engineering, Zhejiang University of Technology, Hangzhou, 310014, China;Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, 310027, China;Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, 310027, China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China (Grant No 60078002). |
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| 摘 要： | 对Ce:BaTiO3晶体中光折变光栅的暗衰减特性进行了实验研究，观测到了晶体禁带中的Fe离子和Ce离子两个深陷阱能级同时参与了光折变过程。在单深能级模型和浅－深能级模型的基础上，提出了简化的双深能级模型，并根据该模型定量地分析了Fe离子和Ce离子每个深陷阱能级在不同光栅波矢、不同光栅写入光强时对总空间电场以及光折变光栅的贡献。
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| 关 键 词： | 暗衰减；光折变光栅；Ce:BaTiO3；简化的双深能级模型 |
| 收稿时间： | 2004-10-27 |
Dark decay behaviours of photorefractive grating induced by two deep-trap levels in Ce:BaTiO3 |
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| Zhang Ming,Xu Ying and Hong Zhi. Dark decay behaviours of photorefractive grating induced by two deep-trap levels in Ce:BaTiO3[J]. Chinese Physics, 2005, 14(5): 995-998 |
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| Authors: | Zhang Ming Xu Ying Hong Zhi |
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| Affiliation: | Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, 310027, China; Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, 310027, China;College of Information Engineering, Zhejiang University of Technology, Hangzhou, 310014, China |
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| Abstract: | Dark decay behaviors of photorefractive grating in Ce:BaTiO3 crystal are studied experimentally. It is observed that two deep-trap levels, i.e. Fe-ion deep level and Ce-ion deep level, both participate in the photorefractive process. A simplified two-deep model is presented based on the one-deep trap model and the shallow-deep trap model, with which we analyze quantitatively the contribution of each deep level to the whole space-electric field and thus the photorefractive grating varying with the different grating wave vectors and different writing intensities. |
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| Keywords: | dark decay photorefractive grating Ce:BaTiO3 simplified two-deep model |
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