闭路光伏明空间光孤子的自偏转特性

利用微扰方法,通过考虑扩散效应的影响,分析了闭路光伏光折变晶体中的光伏明空间光孤子的自偏转特性。结果表明,光伏明孤子的中心沿着一条抛物线轨迹偏转,中央空间频率分量随传播距离线性移动。无论是空间位移还是偏向角都正比于分别同漂移效应和光伏效应相关的两个无量纲量的积。闭路光伏明孤子具有同屏蔽明孤子相类似的自偏转特征。

Self-deflection characteristics of bright photovoltaic spatial solitons in closed-circuit realization

The self deflection process of bright photovoltaic spatial solitons in photovoltaic photorefractive media is investigated by taking into account diffusion effects.By using perturbation techniques,it is found that the center of the optical beam moves on a parabolic trajectory and,moreover,the central spatial frequency component shifts linearly with the propagation distance.Both the spatial deflection and the angular deviation are proportional to the product of two dimensionless quantities which are associated with the diffusion and the photovoltaic process,respectively.The photovoltaic solitons have a similar way to screening solitons in self bending process.