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
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
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.
Received: 27 October 2004
Revised: 09 December 2004
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant No 60078002).
Cite this article:
Zhang Ming (张明), Xu Ying (徐英), Hong Zhi (洪治) Dark decay behaviours of photorefractive grating induced by two deep-trap levels in Ce:BaTiO3 2005 Chinese Physics 14 995
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