自聚焦克尔类电介质中非傍轴光束调制非稳的研究

将非傍轴效应等效为四阶空间色散、五阶非线性效应和自陡峭效应加以处理.利用线性稳定法研究非傍轴光束在非线性克尔介质中的传播稳定性.理论分析和数值模拟均表明，入射功率p₀和非傍轴参量a决定非傍轴光束调制非稳增益谱呈现出三种不同的分布规律，并给出相应判据以区分三种不同分布. 关键词： 非傍轴光束 调制非稳 增益谱 克尔介质

Modulation instability of non-paraxial beams for self-focusing Kerr media

Propagation stability of non-paraxial beam in nonlinear Kerr media is investiga ted by using the linear stability method.Both theoretical anal ysis and numerical simulation show that the modulation instability gain spectrum has thr ee d ifferent distribution features, which are determined by ap 0, where a a nd p 0 represent the non-paraxial parameter and the incident power, respec tively. Furthermore, the corresponding criterion is given to distinguish the thr ee different distributions.