掺偶氮苯聚合物的光致折射率改变特性  

Characterization of Photoinduced Refractive Index Change in the Azobenzene Doped Polymer

作　　者：郑国梁[1] 黎扬钢[1] 罗洋城[1] 陆伟[1] 佘卫龙[1] 

机构地区：[1]中山大学光电材料与技术国家重点实验室和中山大学物理系,广东广州510275

出　　处：《中国激光》2005年第2期269-273,共5页Chinese Journal of Lasers

基　　金：广东省科技计划(A1060201);广州市科技计划(2002J1 C0111)资助项目

摘　　要：　采用表面反射方法研究块状掺偶氮苯聚合物的光致折射率改变特性及其与光强的依赖关系。实验中,使用514 nm的圆偏振Ar+激光作为抽运光,632. 8 nm的He Ne激光(s偏振)作为探测光。通过改变探测光入射角,测量样品在固定光强(0 570 W/cm2)的前向抽运光激励下表面反射率的改变量,研究样品的折射率改变特性,发现样品的光致折射率改变约为-0 .0035;研究了这种效应对抽运光强度的依赖关系,发现光致折射率改变随抽运光强度增大而增大,当抽运光强为0. 800 W/cm2 时,折射率改变量可达10-2量级。The characterization of photoinduced refractive index change (Δn) and the relation between Δn and the intensity of pumping beam in the azobenzene doped polymer are investigated using surface-reflection configuration in which a circularly polarized pumping beam at 514 nm and a probing beam (s-ray) at 632.8 nm are used. For a given pumping intensity (0.570 W/cm2), the surface reflectivity of the sample is measured at a series of incident angles of the probing beam, and the Δn is about -0.0035. Furthermore, the investigation shows that Δn increases with increasing the intensity of pumping beam, and An reaches a value of 10-2 when the intensity of pumping beam is 0.800 W/cm2.

关 键 词：非线性光学 光致折射率改变 表面反射方法 菲涅耳公式 偶氮苯聚合物 

分 类 号：O437[机械工程—光学工程]