三维自散焦介质中交叉传输的光束诱导聚焦  

Induced focusing of cross-copropagating beams in the three-dimensional self-defocusing nonlinear media

作　　者：李华刚[1] 

机构地区：[1]广东教育学院物理系,广东广州510303

出　　处：《量子电子学报》2009年第3期352-355,共4页Chinese Journal of Quantum Electronics

摘　　要：关于自散焦介质光束的诱导聚焦问题,二维理论模型与三维体材料中的实验结果只能定性而不能定量地吻合。只有三维理论模型才能定量地描述体材料中的实验现象,但这样的结果至今没有报道。讨论了三维空间中具有一定夹角的双光束传输问题,严格推导出这种情形下的光束耦合传输方程,并且证明了对小夹角双光束传输过程的描述,可以通过具有对横向空间坐标线性"啁啾"相位的初始条件和平行双光束非线性薛定谔耦合方程构成的Cauchy(初值)问题来实现。三维理论模型的数值模拟结果和Stentz的实验结果定量地吻合。In the research of induced focusing of a beam in self-defocusing media, two-dimensional theoretical model can agree with the three-dimensional experimental results only qualitatively. And there is no threedimensional theoretical model that can describe the experimental phenomena quantificationally up to now. The transmission of two beams with an angle in the three-dimensional media is discussed. Exactitude derivation of three-dimensional coupled equations is given, and it is found that the description of the beam transmission in this situation is related with the Cauchy problem of the nonlinear coupled equations and the initial conditions of the linear ＂ chatter ＂ phase. The simfilative results based on the three-dimensional theoretical model agree with the experimental results quantificationally.

关 键 词：非线性光学 非线性折射率 交叉相位调制效应 诱导光束聚焦 自散焦介质 

分 类 号：O437.5[机械工程—光学工程]