Poly-3BCMU 薄膜光漂白过程的理论模型

本文报道了使用两种不同漂白光源时,Poly-3BCMU薄膜的光漂白过程,并建立了描述漂白过程的理论模型.最后讨论了采用光漂白方法制备导波微光学元件的可能性.     

Orientation of azobenzene molecules in polymer films induced by all-optical poling

A model of the alignment of azobenzene molecules in polymer film induced by all-optical poling is proposed and verified by experiment. We found that when the writing beams of frequencies ω and 2ω are both linearly polarized with their polarization directions parallel to each other, azobenzene molecules tend to reorient to the direction perpendicular to the writing beams polarization. At the end of the writing process, more molecules orient to the direction perpendicular to the writing beams polarization than those which orient to the parallel direction. The alignment of molecules parallel or perpendicular to the polarization of the writing beams is characteristic of polarity or no polarity, respectively. The alignment of molecules along the polarization of writing beams results in the second order nonlinearity in the polymer film. According to the model, a new method to improve the optical poling efficiency is put forward.     

复合抛物面型集光器与多模光纤的耦合

分析讨论了复合抛物面型集光器与多模光纤的耦合效率和集光器设计之间的关系，提出了采用截底法和截顶法提高集光器与多模光纤耦合效率的方案。     

全光极化聚合物薄膜中染料分子取向的模型

对光极化后偶氮染料聚合物薄膜中染料分子的取向方式进行了研究,指出当写入光（基频与其倍频光）为线偏振且偏振方向互相平行时,极化薄膜中多数染料分子垂直写入光偏振的方向作轴向排列,而少数分子沿平行于写入光偏振的方向作极性排列,但只有后者对薄膜的宏观二阶非线性有贡献,实验证实了上述模型。