| Anomalous behaviour of long-time increase in diffraction efficiency of photorefractive grating in Ce：BaTiO3 in dark |
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| 引用本文： | 张嘉文,张明,徐英,洪治.Anomalous behaviour of long-time increase in diffraction efficiency of photorefractive grating in Ce：BaTiO3 in dark[J].中国物理 B,2006,15(4):729-734. |
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| 作者姓名： | 张嘉文 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;Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation,Zhejiang University,Hangzhou 310027,China;Zhejiang Provincial Key Lab. of Optic Fiber Communication
Technology,Zhejiang University of Technology,Hangzh;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： | Anomalous long-time increase of the diffraction efficiency is observed in dark-decay experiments of photorefractive gratings in Ce：BaTiO3. It is deduced that a phase-conjugate beam is induced by the writing beam at acute angle to the ＋c axis of the crystal and it interferes with the other writing beam to form a second grating which is perpendicular to the first grating formed by the interference between two writing beams. The rising behaviour of the diffraction efficiency results from the different decay rates of these two photorefractive gratings. Furthermore, a simplified model of two gratings, both induced by two deep traps, is proposed to account for this phenomenon and the fitting results agree well with the experimental results.
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| 关 键 词： | 黑暗衰变 光折射光栅 双深阱模型 空间电场 |
| 收稿时间： | 2005-09-20 |
| 修稿时间： | 2005-09-202005-11-13 |
Anomalous behaviour of long-time increase in diffraction efficiency of photorefractive grating in Ce:BaTiO3 in dark |
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| Zhang Jia-Wen,Zhang Ming,Xu Ying and Hong Zhi.Anomalous behaviour of long-time increase in diffraction efficiency of photorefractive grating in Ce:BaTiO3 in dark[J].Chinese Physics B,2006,15(4):729-734. |
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| Authors: | Zhang Jia-Wen Zhang Ming Xu Ying and 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;Zhejiang Provincial Key Lab. of Optic Fiber Communication
Technology,Zhejiang University of Technology,Hangzh |
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| Abstract: | Anomalous long-time increase of the diffraction efficiency is observed in
dark-decay experiments of photorefractive gratings in Ce:BaTiO2. It is
deduced that a phase-conjugate beam is induced by the writing beam at acute
angle to the +c axis of the crystal and it interferes with the other writing
beam to form a second grating which is perpendicular to the first grating
formed by the interference between two writing beams. The rising behaviour of
the diffraction efficiency results from the different decay rates of
these two photorefractive gratings. Furthermore, a simplified model of two
gratings, both induced by two deep traps, is proposed to account for this
phenomenon and the fitting results agree well with the experimental results. |
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| Keywords: | dark decay photorefractive grating two deep-trap model Ce:BaTiO$_{3}$ |
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