有机分子系统非线性折射的类型

THE TYPES OF NONLINEAR REFRACTION IN ORGANIC MOLECULAR SYSTEM

从分子系统的微观机制出发 ,采用单重态四能级模型讨论非线性折射随光强的变化情况 ,分析了非线性折射的各种形式产生的条件 ,定义了非线性折射的饱和现象、反饱和现象相互转化的阈值光强 .发现了非线性折射率随光强发生正负变化的现象 .

The change of nonlinear refractive index of organic molecular system with incident fluence is discussed based on singlet fourenergylevel.The conditions for the occurrence of different types of nonlinear refraction are given and the intensity threshold expression for the interchanges between saturation and reverse saturation is derived.The conversion between saturation and reverse saturation leads to the change of refractive index from positive to negative.