强非局域非线性介质中的非相干孤子研究  

Study on Incoherent Solitons in Strong Nonlocal Nonlinear Media

作　　者：刘雅洁[1] 朱宁[1] 童佳[1] 冯启元[2] 

机构地区：[1]嘉兴学院物理教研室,浙江嘉兴314001 [2]内蒙古大学物理系,内蒙古呼和浩特010021

出　　处：《量子光学学报》2009年第3期253-259,共7页Journal of Quantum Optics

摘　　要：本文从一维强非局域非线性模型出发,推导出非相干光满足的非线性薛定谔方程。按照相干密度描述方法,写出非相干光的描述方式,求出了非相干光孤子的形成条件和孤子形式,还得到了相干光和非相干光在强非局域非线性介质中形成孤子的临界功率,结果说明非相干光形成孤子时,需要更高的能量。当非相干光孤子的条件不满足时,非相干光束以呈现振荡行为。空间振荡周期仅与介质、入射的非相干光的光功率有关,而与光源的非相干角功率谱宽度及具体组分无关。同时,我们还数值模拟了这种非相干光束的振荡行为和单一组分、一对组分的非相干强度演化过程。The nonlinear Schrodinger equation satisfied by optical field in 1-D strong nonlocal nonliear media has been derived from scalar Helmhohz equation. The incoherent beam expressed by coherence density would form incoherent solitons with Gaussian profile at some condition, and has higher threshold power than the one of coherent beam. If the condition is not matched by incoherent beam, the incoherent beam would oscillate at a spatial period determined by the characteristic of the media and the injecting power of the incoherent beam. The evolution of the oscillating feature of the incoherent beam, the evolution of a single portion and a pair of portion of the incoherent beam are analyzed numerically.

关 键 词：非局域非线性介质 非相干孤子 相干密度 

分 类 号：O431[机械工程—光学工程]