低玻璃化转变温度掺杂有机聚合物体系的光折变效应

Photorefractive Effect in a Doped Polymer System witha Low Glass Transition Temperature

报道了一种低玻璃化转变温度掺杂有机聚合物体系中的光折变效应。研究了ＰＶＫ－Ｃ６０薄膜的光电导特性，测量了ＰＶＫ－硝基偶氮苯的电光系数。在ＰＶＫ－Ｃ６０－硝基偶氮苯－邻苯二甲酸二丁胸（ＤＢＰ）厚膜中实现了光学简并四波混频和两束耦合，在较低的场强下（１６．４Ｖ／ｕｍ），获得高达１．５％的四波混频衍射效率。实验表明了ＤＢＰ增塑剂的引入有效地增加了取向对光折变效应的贡献．提高了材料的光折变性能。

in this paper, photorefractive effect in a doped polymer system with a low glasstransition temperature (Tg) is reported. Photoconductivity of a PVK-C60 thin film has beeninvestigated and electro-optic coefficiency of a PVK-nitroazobenzene thin film has beenmeasured. Optical degenerate four-wave mixing and two-beam coupling experiments havebeen done in the thick film of PVK-C60-nitroazabenzene-dibutyl phthalate (DBP). Thediffraction efficiency of 1. 5% for the four-wave mixing was obtained under a relativelylow field of 16. 4V/um. The experimental results reveal that the plasticizer, DBP,effectively enhanced the photorefrective effect by an orientational mechanism, and theproperty of the photorefractivity of the material has been improved.