光纤中高阶非线性的微观模型
Microscopic model for the higher-order nonlinearity in optical filaments
摘要：
使用一个完全可溶的一维原子模型，我们探讨的想法，最近观察到的高阶非线性光学细丝是由于虚拟的过渡涉及连续态。我们表明，该模型的行为是定性的实验观察到的交叉从自聚焦到散焦在高强度的可比性，并只发生在强度，导致显着的电离。基于这些观察，我们推测这种连续电子非线性折射具有很强的记忆效应，而且最重要的是，它的符号变化被自由电子引起的散焦有效地掩盖了.
英文摘要：
Using an exactly soluble one-dimensional atomic model we explore the idea that the recently observed high-order nonlinearity in optical filaments is due to virtual transitions involving the continuum states. We show that the model's behavior is qualitatively comparable with the experimentally observed cross-over from self-focusing to de-focusing at high intensities, and only occurs at intensities which result in significant ionization. Based on these observations, we conjecture that this continuum electron nonlinear refraction exhibits strong memory effects, and most importantly, the change of its sign is effectively masked by the de-focusing due to free electrons.
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