介绍了确定有机分子二阶非线性极化率的方法,如超瑞利散射技术、溶致变色法、电场诱导二次谐波(EFISHG),全光极化.在分子结构的角度上总结了共轭分子的链长、取代基的电子特性、共轭骨架与二阶非线性极化率的关系.共扼长度的增加和共扼体系的扩展有利于电子在更大范围内发生转移.给电子能力和受体的吸电子能力越强,越有利于体系形成电荷转移的共振态,扩大(π)电子的流动范围,使分子在外场中更易发生分子内电荷转移而有利于增强分子的微观倍频效应.
Several kinds of methods to determine second-order nonlinear coefficient of organic materials are in-troduced,such as hyper-rayleigh scattering,solvatochromic,EFISHG,all-optical poling.The relationship of the molec-ular length,the electronic property of substituent,conjugated skeleton and the second order NLO properties are stu-died on the molecular structure angle.With the increase of conjugation length,the expansion of conjugate system,the electron transfers easily in large region.The abilities of donor and acceptor stronger,the charge-transfer resonance states forms,the scope of movement of π electrons expands to enhance the SHG.
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