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Polymeric composite photorefractive materials for nonlinear optical a

机译：用于非线性光学的聚合物复合光折变材料

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Abstract: Polymeric composite materials constitute a new and very promising class of photorefractive materials. In the design of polymeric photorefractive materials we use multicomponent composites in which necessary functionalities can be independently optimized. The investigated composites consisted of charge transporting polymeric matrix, and optically second-order active molecules. Two different photosensitizers were used to vary the wavelength response. Photorefractive properties of these materials were investigated using erasable volume holography in a non-degenerate four-wave mixing geometry and two-beam coupling techniques. A previously developed model of space-charge field grating formation in photoconductive polymers was used to explain the field dependence of four-wave mixing diffraction efficiency. The model takes into account the field dependence of charge photogeneration quantum yield, carrier field mobility, and electro-optic coefficient. Necessary information about these parameters was obtained from the results of photoconductivity and electro-optic modulation experiments. Special attention was focused on the kinetics of photorefractive response in the composite for optical signal processing and optical storage. It was found that a very effective switching of diffraction efficiency induced by dc electric field occurs in this system. Also, the results of kinetic studies of the index grating writing and its subsequent light-induced erasure, as well as a demonstration of the holographic image recording and retrieval, are reported. !12
机译：摘要：高分子复合材料构成了一种新型且很有前途的光折变材料。在聚合物光折射材料的设计中，我们使用多组分复合材料，其中必要的功能可以独立优化。研究的复合材料由电荷传输聚合物基体和光学二级活性分子组成。使用两种不同的光敏剂来改变波长响应。在不退化的四波混合几何和两束耦合技术中，使用可擦除体积全息技术研究了这些材料的光折变特性。使用先前开发的在光电导聚合物中形成空间电荷场光栅的模型来解释四波混合衍射效率的场依赖性。该模型考虑了电荷光生量子产率，载流子场迁移率和电光系数的场依赖性。这些参数的必要信息是从光电导和电光调制实验的结果中获得的。特别注意的是光复合材料中用于光信号处理和光存储的光折变​​响应动力学。已经发现，在该系统中发生了由直流电场引起的衍射效率的非常有效的转换。此外，还报告了索引光栅写入及其后续光诱导擦除的动力学研究结果，以及全息图像记录和检索的演示。 ！12

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