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大调制度下光折变运动光栅的微扰分析
引用本文:冯玉文,周忠祥,姜永远,孙秀冬,许克彬.大调制度下光折变运动光栅的微扰分析[J].物理学报,1998,47(4):598-605.
作者姓名:冯玉文  周忠祥  姜永远  孙秀冬  许克彬
作者单位:哈尔滨工业大学应用物理系,哈尔滨 150001
基金项目:黑龙江省自然科学基金资助的课题.
摘    要:利用“跳跃模型”讨论了大调制度下光折变材料对运动干涉条纹的非静态记录过程,给出了描述运动干涉条纹非静态记录时电荷密度波前三阶分量振幅的微分方程,以及前三阶空间电荷场的解析表达式.讨论了前三阶空间电荷场振幅改变量对干涉条纹运动速度的依赖关系,若扩散场不为零但较小时,施加较小的外电场能够实现对空间电荷场高阶分量选择性地增强.若扩散场较大(大于外加电场),则不能实现对空间电荷场高阶分量选择性地增强. 关键词

关 键 词:晶体  光栅  大调制度  光折变  运动光栅  微扰分析
收稿时间:1997-08-21

PERTURBATIVE ANALYSIS OF PHOTOREFRACTIVE MOVING GRATING AT LARGE MODULATION DEPTHS
FENG YU-WEN,ZHOU ZHONG-XIANG,JIANG YONG-YUAN,SUN XIU-DONG and XU KE-BIN.PERTURBATIVE ANALYSIS OF PHOTOREFRACTIVE MOVING GRATING AT LARGE MODULATION DEPTHS[J].Acta Physica Sinica,1998,47(4):598-605.
Authors:FENG YU-WEN  ZHOU ZHONG-XIANG  JIANG YONG-YUAN  SUN XIU-DONG and XU KE-BIN
Abstract:We have discussed the recording of moving grating in photorefractive materials at large modulation depths using hopping model.The analytical expressions of the first three-order spatial charge field are presented which describe the nonstatic recording of the moving fringes.And the dependence of the space charge field on the veloctiy of the moving fringes is discussed for non diffusive field.We found that the higher-order harmonics of the space charge field for low diffusive field can be selectively enhanced with applied small dc field.Otherwise,they cannot be selectively enhanced if the diffusive field is large than the applied electric field.
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