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The formation of the spatial solitons in the quadratic nonlinearity χ(2) media by cascading second harmonicgeneration (SHG) in quasi-phase-matched (QPM) sample is studied on the basis of nonlinear Schrodingerequation (NLSE). When the solitary wave propagates in the QPM media, it formed optical wave-guidesthrough cascading χ(2) effect called self-induced soliton wave-guide. Transverse refractive index distribu-tion of the self-induced soliton wave-guide of fundamental and SHG wave is obtained by cascading process.Analysis of guided-mode of such self-induced soliton wave-guide is first proposed to our knowledge. Be-cause the power needed for forming the spatial solitons in cascading process is much lower than that inKerr media, this kind of self-induced soliton wave-guide shows potential applications in all-optical signalprocess. 相似文献
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本文从理论上研究了主克尔型介质中非束缚态空间亮孤子的传输行为数值计算结果表明:在主克尔型χ(3)+χ(5)介质中可以传输非束缚态空间亮孤子传输稳定性与其背景平面波的横向渐近传播常数q和χ(3),χ(5)系数有关,非平凡相位因子在三、五阶效应竞争中的平衡作用,是获得非束缚态空间亮孤子稳定传输的关键 相似文献
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Poly—3BCMU薄膜光漂白的实验研究 总被引:6,自引:1,他引:5
报道了Poly-3BCMU薄膜光漂白过程的实验研究结果。测量了薄膜漂白前后的可见及紫外光谱的变化,表明在光漂白过程中聚合物的长链被逐断打断。实验表明,被漂白的聚合物薄膜可以被某些有机溶剂溶解,导致所谓的显影响过程。 相似文献