分子共平面，共轭作用强，对增大二阶光学非线性有利。
Coplanar molecules having stronger conjugation effects facilitate the nonlinear second-order optical susceptibilities too.
作为一类特殊的透明介质，非线性光学晶体因其具有不同于各向同性介质的结构，因而在与飞秒光脉冲相互作用时，可能会产生很多新的物理现象。
As a special kind of transparent material, nonlinear optical crystal may induce some more phenomena when femtosecond laser pulse propagate in it because of its peculiar structure.
本文利用变分原理，通过非线性薛定谔方程，导出光纤中传输的光学孤子相互作用。
The interaction between two optical soliton is derived from nonlinear Schrodinger equation by variational approach.
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