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偶氮乙基橙掺杂聚乙烯醇薄膜自衍射效率的动态特性分析

, PP. 178-182

Keywords: 非线性光学,自衍射,粒子数光栅,乙基橙

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Abstract:

两束强度相等的相干光小角度在乙基橙-聚乙烯醇(EO/PVA)膜中耦合时,产生自衍射现象.我们对自衍射效率的动态特性进行了实验研究,实验表明(1)当入射光强较小(I=100mW/cm2)时,一阶衍射效率η随照射时间的延长从零上升至一稳定值;(2)入射光强较大(I=480mW/cm2)时,一阶衍射效率η从零开始迅速上升到一最大值ηm后再降至一稳定值ηs.以耦合光在膜中的干涉光场对trans-cis态的分子数分布进行调制而形成的粒子数光栅为模型,对衍射效率的动态特性进行了理论分析,理论与实验结果相符合。

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