摘要
由光束在克尔型吸收介质中传输的非线性薛定谔方程,推导了高斯光束注入介质后满足的耦合方程,并分别在不考虑吸收和高阶展开项的情况下,对脉冲的腰斑半径的演化进行了理论分析。发现当注入脉冲满足一定的条件时,脉冲可以以“孤波”的形式传播。当考虑吸收和高阶展开项时,脉冲不存在“孤波”形式,且存在一个阈值,低于阈值的输入,脉冲发生自聚焦;对高于阈值的输入,腰斑半径随着距离的增加而增加,聚焦趋势根本就不存在。
From the nonlinear Schroedinger equation of beam propagating in absorptive Kerr medium, a set of evolution equations describing Gaussian beam waist have bean derivated. As inexistence absorption and high order explanate term, the input pulse would behave solitary wave with theoretical analysis . As existence absorption and high order explanate term, the input beam behaving solitary wave is destroyed with analysis numerical. And there is a threshold, as lower this threshold the input beam behaves focusing only, but as higher this threshold the input beam behaves diffraction stronly.
出处
《光散射学报》
2006年第2期183-187,共5页
The Journal of Light Scattering
关键词
克尔型吸收介质
腰斑半径
孤波
自聚焦
absorptive kerr medium
waist radius
solitary wave
self-focusing
