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arXiv 1402.6915physics.optics
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准相位匹配二次介质中的精确级联非线性

Exact cascading nonlinearity in quasi-phase-matched quadratic media

Matteo Conforti

摘要:

光脉冲和光束在准相位匹配(QPM)二次介质中的演化通常只考虑QPM光栅的空间谐波,使残余相位失配最小化。我表明,强烈的相位失配的相互作用(级联制度),几个谐波需要考虑,以获得正确的有效立方非线性,其中我找到一个简单的解析表达式的值。讨论了光栅的高次谐波对孤立波传播的影响。

英文摘要:

The evolution of light pulses and beams in a quasi-phase-matched (QPM) quadratic medium is usually described by considering only the spatial harmonic of the QPM grating that minimizes the residual phase-mismatch. I show that, for strongly phase-mismatched interactions (the cascading regime), several harmonics need to be accounted for in order to obtain the correct value of the effective cubic nonlinearity, of which I find a simple analytical expression. I discuss the effects of the higher order harmonics of the grating on solitary wave propagation.

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