方酸衍生物的三阶非线性光学特性  

Third-order optical nonlinearities of squaraine derivatives

作　　者：徐松[1] 吴秋萍[1] 李忠玉[2] 

机构地区：[1]东北电力大学应用技术学院,吉林吉林132021 [2]吉林化工学院化学工程系,吉林吉林132022

出　　处：《光学精密工程》2007年第11期1674-1677,共4页Optics and Precision Engineering

基　　金：博士后科学基金资助项目(No.20060390056)

摘　　要：采用波长为800nm、脉宽为50fs的激光系统，运用双光束前向简并四波混频技术（DFWM）研究了两种方酸衍生物的三阶非线性光学特性，并探讨了它们的非线性形成机制。实验测得所研究的两种方酸衍生物的分子超极化率7值均为～10^-31esu，其非线性光学响应时间小于激光脉宽（50fs）。因而，所研究的方酸衍生物有较大的三阶非线性光学性质和较快的光学响应，在光学器件中具有潜在的应用价值。In order to find and study the nonlinear optical materials with large third-order optical non-linearities to fabricate optical devices, the third-order optical nonlinearities and dynamic responses of two kinds of squaraine derivatives were measured using femtosecond Degenerate Four-wave Mixing （DFWM） technique at 800 nm. The second-order hyperpolarizabilities of squaraine derivatives are as large as 10^-31 esu, and the response time is shorter than the experimental time resolution of laser. It is clarified that the squaraine derivatives both have large third-order optical nonlinearities and fast optical response under off-resonant conditions, which indicates that the squaraine derivatives have potential applications in nonlinear optics.

关 键 词：三阶非线性光学 简并四波混频 方酸衍生物 分子超极化率 

分 类 号：O437[机械工程—光学工程]