双光束在自散焦介质中对向共同传输时的诱导聚焦

Induced focusing due to two optical beamscounterpropagating in self-defocusing nonlinear media

对二维自散焦介质中双光束对向共同传输问题进行了系统研究 .数值模拟结果表明 :在适当的条件下 ,强的抽运光能通过交叉相位调制效应诱导弱的信号光聚焦 .讨论了样品长度、抽运光初始振幅、信号光初始振幅及两光束中心初始横向间距 4个参数对信号光聚焦过程的影响 ,发现存在最佳参数值 。

In this paper,a research work is done on two optical beams co_propagating in opposite directions in two_dimensional self_defocusing nonlinear media.Numerical results show that the probe beam can be induced to focus due to cross_phase modulation by the pump beam under certain conditions.We also discuss the effect on the focusing of the probe beam from the four parameters:the specimen length,the initial amplitudes of the pump beam and the probe beam,and the initial transversal distance between the centers of the two beams.We find that some of them have optimum values,which result in the strongest focusing.