中国物理B ›› 2005, Vol. 14 ›› Issue (5): 995-998.doi: 10.1088/1009-1963/14/5/024

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Dark decay behaviours of photorefractive grating induced by two deep-trap levels in Ce:BaTiO3

徐英1, 洪治1, 张明2   

  1. (1)Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, 310027, China; (2)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
  • 收稿日期:2004-10-27 修回日期:2004-12-09 出版日期:2005-05-19 发布日期:2005-05-19
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 60078002).

Dark decay behaviours of photorefractive grating induced by two deep-trap levels in Ce:BaTiO3

Zhang Ming (张明)ab, Xu Ying (徐英)a, Hong Zhi (洪治)a   

  1. a Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China; b College of Information Engineering, Zhejiang University of Technology, Hangzhou 310014, China
  • Received:2004-10-27 Revised:2004-12-09 Online:2005-05-19 Published:2005-05-19
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 60078002).

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摘要： 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.

关键词: dark decay, photorefractive grating, Ce:BaTiO3, simplified two-deep model

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.

Key words: dark decay, photorefractive grating, Ce:BaTiO3, simplified two-deep model

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