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．
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.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第4期598-605,共8页
Acta Physica Sinica
基金
黑龙江省自然科学基金
