Investigation on the phase shifts of extinction and phase gratings in polymethyl methacrylate  

作　　者：李威 唐柏权 张心正 高峰 刘龙昌 吴强 潘雷霆 楼慈波 郭尚雨 Romano A.Rupp 许京军 

机构地区：[1]The MOE key Laboratory of Weak-Light Nonlinear Photonics,TEDA Applied Physics School,Nankai University [2]School of Physics,Nankai University

出　　处：《Chinese Optics Letters》2010年第1期18-21,共4页中国光学快报（英文版）

基　　金：supported by the Tianjin Natural Science Foundation(No.07JCYBJC16600);the National Natural Science Foundation of China(Nos.10874093, 10604033,and 10804055);the National Basic Research Program of China(No.2007CB307002);the Key International S&T Cooperation Project(No.2005DFA10170); the"111"Project of China(No.B07013);the National"973"Program of China(No.2007CB613203)

摘　　要：The phase shifts of the extinction and refractive index gratings to the illumination pattern are revealed in doped polymethyl methacrylate （PMMA）. The dynamic process of these shifts is studied via two-wave coupling at 351 nm. It is shown that these shifts are from the strain and the shrinkage inside the sample and accompanied with the photo-repolymerization process during the building process of the holographic grating. Such shifts will cause obvious energy exchange between the two recording beams and enough attention should be paid to the nonlocal property of the holographic gratings of the material in the application.The phase shifts of the extinction and refractive index gratings to the illumination pattern are revealed in doped polymethyl methacrylate （PMMA）. The dynamic process of these shifts is studied via two-wave coupling at 351 nm. It is shown that these shifts are from the strain and the shrinkage inside the sample and accompanied with the photo-repolymerization process during the building process of the holographic grating. Such shifts will cause obvious energy exchange between the two recording beams and enough attention should be paid to the nonlocal property of the holographic gratings of the material in the application.

关 键 词：Holographic gratings Refractive index 

分 类 号：O631.3[理学—高分子化学]