We first take up the subject of optic ray propagation through a variety of optical media. 首先研究光束通过各种光学介质的传播问题。
A detail study was made on the phase conjugate process in the near degenerate four wave mixing in a nonlinear medium based on solving of the coupled wave equations. 从求解耦合波方程出发，详细研究了非线性光学介质中由近简并四波混频所产生的相位共轭过程。
