Heterodyned Femtosecond Optical Kerr Effect of Substituted Conjugated Polymers  

作　　者：LIN Li QIAN Wei WANG Cong-fang ZOU Ying-hua WANG Qian CHEN Hui-ying 林立;钱卫;王从方;邹英华;王茜;陈慧英(Department of Physics,Mesoscopic Physics Laboratory;Institute of Polymer Science,College of Chemistry,Peking University,Beijing 100871)

机构地区：[1]Department of Physics,Mesoscopic Physics Laboratory [2]Institute of Polymer Science,College of Chemistry,Peking University,Beijing 100871

出　　处：《Chinese Physics Letters》1999年第9期656-658,共3页中国物理快报（英文版）

基　　金：the National Natural Science Foundation of China under Grant Nos.19774002 and 29474148 and Doctoral Program Foundation of Higher Education Institution.

摘　　要：The femtosecond optical heterodyne detected optical Kerr effect is described.The real and the imaginary parts of complex third-order optical nonlinearity can be effectively separated and their values and signs can be determined.Using this method,we have thoroughly investigated the substitution effect by adding side-groups on the-(-C=N-)-conjugated system,a new class of nonlinear optical material,and find that the polybenzonitrile(γr=-1.59 x10^(-31) esu,m=6)is an order of magnitude superior to poly-amino-nitrile.But when we further add substituents on benzoid rings,the enhancement is limited.We can say that for the series of polybenzonitrile,the benzoid ring can improve the x^(3)value more effectively than other substitutions.

关 键 词：NITRILE imaginary NONLINEARITY 

分 类 号：O62[理学—有机化学]