【作者】 刘重；

【导师】 刘益春；

【作者基本信息】 东北师范大学 ， 凝聚态物理， 2007， 硕士

【摘要】 本文在合成了一种新的双偶氮材料(BA1)的基础上,研究了BA1材料掺杂聚甲基丙烯酸甲酯(PMMA)薄膜的光学存储特性,当材料受到波长为532 nm的激光激发时,部分分子发生了反-反到顺-顺的异构变化,同时双偶氮分子沿垂直于偏振光偏振方向排列,引起了光致双折射。利用光致异构理论和分子取向理论解释了光致双折射与泵浦光光强和薄膜染料浓度之间的关系,研究了光栅生长动力学过程,并对实验结果进行了理论解释。利用波长为632.8 nm的He?Ne激光作为写入光,详细研究了在SS ,SP两种偏振态下样品的全息特性;实现了红光存储,研究了红光自衍射全息光栅的生长过程。更多还原

【Abstract】 A new kind of bisazo(BA1) was synthesized as a material candidate for perpetual information storage application. When the sample was pumped by the beam of 532 nm, some BA1 molecules underwent a reversible trans–trans to cis–cis isomerization in the polymer matrix, resulting in photo-induced birefringence. Hence, the photo-induced birefringence was investigated at various concentrations and the dependence of the transmission signals on the pumping beam intensities in BA1 doped poly (methyl methacrylate) (PMMA) film was studied, Photoisomerization and molecular orientation theory used to explain the experiment results. A reasonable theory was given to explain the dynamic process .The two types of polarization holographic (parallel state (SS) and orthogonal state (SP)) recording in BA1 doped PMMA films were studied. Self-diffracted holographic gratings were optically recorded with a pair of interferential He–Ne laser beams (632.8nm). Reversible holograms were recorded in the medium.更多还原