新的偶氮类有机共轭化合物的合成及三阶非线性光学性能  

Synthesis and Third-Order Optical Nonlinearities of New Organic Conjugated Azo Compounds

作　　者：蔡志彬[1] 周茂 高建荣[1] 

机构地区：[1]浙江工业大学精细化工研究所,浙江杭州310014 [2]杭州赛利药物研究所,浙江杭州3100052

出　　处：《中国激光》2009年第4期972-977,共6页Chinese Journal of Lasers

基　　金：浙江省自然科学基金(Y4080370)资助项目

摘　　要：设计合成了6个新的偶氮类有机共轭化合物,用傅里叶变换红外光谱仪(FT-1R),~1H核磁共振(~1H NMR)和元素分析确证了结构。采用飞秒激光,运用简并四波混频(DFWM)法,研究了化合物在非共振状态下的三阶非线性光学(NLO)性能。它们的三阶非线性光学极化率X^(3)为(3.31～3.96)×10^(-13)esu,非线性折射率n^2为(6.08～7.27)×10^(-12)esu,分子二阶超极化率γ为(3.44～4.11)×10^(-31)esu,响应时间τ为102～111 fs。探索了化合物的分子结构对三阶非线性光学性能的影响。引入离域能小的芳杂环,增长共轭链,形成吸供构型,增大取代基的供电子能力,提高共轭体系的共平面程度等因素,有利于获得较大的三阶非线性光学性能。Six new organic conjugated azo compounds were synthesized and their structures were confirmed by Fourier transform infrared spectroscopy（FT-IR）, ^1H nuclear magnetic resonance apparatus ^1H NMR and elemental analysis. By using femtosecond laser, the off-resonant third-order optical nonlinearities of the compounds were measured with degenerate four-wave mixing （DFWM） technique. The third-order nonlinear optical （NLO） susceptibilities Χ^（3） were （3.31-3.96） × 10^-13 esu. The nonlinear refractive indexes n2 were （6.08-7.27）× 10^-12 esu. The second-order hyperpolarizabilities y of the molecules were （3.44-4.11） × 10^-31 esu. The response times r were 102- 111 fs. The influence of the molecular structure on the third-order optical nonlinearity was studied. The third-order optical nonlinearity is improved by many factors such as aromatic heterocycle with small delocalization energy, long conjugate chain, formation of acceptor-donor srtucture, strong electron-donating abilities of substituents, and good coplanarity.

关 键 词：非线性光学 简并四波混频 偶氮类有机共轭化合物 合成 

分 类 号：O437[机械工程—光学工程]