泵浦光偏振态的改变对SO/PMMA薄膜光致双折射的影响  

Effect of polarization of pumping beams on the photo-induced birefringence of SO-doped PMMA films

作　　者：付申成[1] 陆子凤[1] 刘益春[1] 董林[2] 胡卫林[3] 谢明贵[3] 

机构地区：[1]东北师范大学先进光电子功能材料研究中心,吉林长春130024 [2]中国科学院长春光学精密机械与物理研究所激发态物理重点实验室,吉林长春130021 [3]四川大学化学学院,四川成都610064

出　　处：《物理实验》2005年第6期16-19,共4页Physics Experimentation

摘　　要：在紫外光伴随下,用偏振态分别为s和p的HeNe激光器发出的632.8nm红光(均为10mW)交替激发螺恶嗪掺杂的聚甲基丙烯酸甲脂薄膜(SO/PMMA),用532nm的绿光(0.1mW)作为探测光记录光致双折射的动力学过程.实验发现透射信号被周期性调制,而且每次调制的最大值随时间逐渐减小并最终趋于稳定.指出了泵浦过程中的异构动态平衡与取向动态平衡并存的物理机制.Photo-induced birefringence of spirooxazine-doped PMMA films is alternately pumped by s and p polarized He-Ne beams (632.8 nm) of 10 mW. A dynamics of photo-induced birefringence is recorded by a linearly polarized double-frequency Nd∶YAG laser (532 nm) of 0.1 mW as a probe beam. It is found that the transmittance signal is periodically modulated by the polarization of the pumping beams and the maximum of the transmittance signals in each period versus time drops gradually to a steady value. The equilibriums of photo-orientation and photo-isomerization induced by He-Ne laser are also investigated.

关 键 词：螺恶嗪 部花青 光致双折射 泵浦光偏振态 

分 类 号：O484.41[理学—固体物理]