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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。
By using the perturbation method, the self-deflection characteristics of photo-bright space optical solitons in the closed-circuit photorefractive crystal are analyzed by considering the influence of diffusion effect. The results show that the center of photovoltaic soliton is deflected along a parabolic trajectory and the frequency component of central space moves linearly with the propagation distance. Both the spatial displacement and the deflection angle are proportional to the two dimensionless quantities associated with the drift effect and the photovoltaic effect, respectively. The closed-circuit photovoltaic bright soliton has the similar self-deflected characteristics as the bright soliton.