非线性波导中高强度光束的周期空间不稳定性

G. Stegeman, R. Schiek, H. Fang, R. Malendevich
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引用次数: 0

摘要

只提供摘要形式。在自聚焦介质中,无限范围的平面波分解成单个强度最大值的周期阵列。这已经在块状二次介质和光折变介质中得到了报道,但在存在解析理论的平板波导中没有报道。在LiNbO/sub - 3/ slab波导中,调制不稳定性(MI)导致了SHG的周期性结构,与理论非常吻合。此外,通过植入周期模式,测量了MI增益系数,结果与理论吻合较好。
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Periodic spatial instabilities of high intensity beams in nonlinear waveguides
Summary form only given. In self-focusing media a plane wave of infinite extent breaks-up into a periodic array of individual intensity maxima. This has been reported in bulk quadratic and photorefractive media, but not in slab waveguides for which analytical theories exist. Modulational instability (MI) leading to periodic structures has been demonstrated for SHG in LiNbO/sub 3/ slab waveguides, in excellent agreement with theory. Furthermore, by seeding the periodic patterns, the MI gain coefficients were measured, and again good agreement with theory.
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