Dynamics of Resonant Third-Order Nonlinear Optical Processesin Molecular Solids and Polymers

这个项目的目的是确定分子和聚合物材料中三阶非线性光学过程的动力学。将开展的研究包括：利用放大的60飞秒脉冲进行简并四波混频和两波混频泵浦-探测实验；通过同时监测简并四波混频过程中的一阶和高阶衍射，研究双光子吸收、双分子衰变和激发饱和的作用；观察初始光产生的激子和随后形成的极化子在确定线性共轭结构中的光学非线性中的相对作用。

This project is aimed at determining the dynamics of third-order nonlinear optical processes in molecular and polymeric materials. Research to be undertaken will include: degenerate four-wave mixing and two-wave mixing pump-probe experiments using amplified 60 femtosecond pulses; investigating the role of two-photon absorption, bimolecular decay, and excitation saturation by simultaneously monitoring both first-order and higher-order diffractions during degenerate four-wave mixing; observing the relative roles of initially photogenerated excitons and subsequently formed polarons in determining optical nonlinearity in linear conjugated structures.