基于外加电场的双光子光伏光折变介质,数值研究了光折变介质中亮屏蔽光伏孤子的自偏转特性.结果表明;考虑扩散效应后,双光子亮屏蔽光伏孤子的中心沿一个抛物线轨迹在晶体光轴的反向上产生自偏转;孤子中心偏转距离首先随着外加电场的增加而增加,当外加电场增加到某一特定值后,孤子的自偏转距离随着外加电场的继续增加反而减小.亮孤子自偏转距离随着入射光强的增加也表现出先增加后减小的非线性变化规律.在一定参量下,对双光子模型与单光子模型的自偏转特性做了简单比较.
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