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arXiv 1206.4906physics.opticsphysics.atom-phquant-ph
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高场量子计算揭示了含时的负克尔贡献

High-field quantum calculation reveals time-dependent negative Kerr contribution

Pierre Béjot, Eric Cormier, Edouard Hertz, Bruno Lavorel, Jérôme Kasparian, Jean-Pierre Wolf, Olivier Faucher

摘要:

研究了强场近红外激发下氢原子的精确量子含时光学响应,并与广泛用于描述强激光场诱导原子有效极化的微扰模型进行了比较。通过求解全三维含时薛定谔方程,我们展示了一个补充的,准瞬时散焦的贡献中缺少的弱场模型的偏振。我们表明,这种影响是远远不能忽略的,特别是当关闭的电离通道发生,源于电子与它们的母离子的相互作用。它提供了一个解释高阶克尔效应最近观察到的各种气体。

英文摘要:

The exact quantum time-dependent optical response of hydrogen under strong field near infrared excitation is investigated and compared to the perturbative model widely used for describing the effective atomic polarization induced by intense laser fields. By solving the full 3D time-dependent Schrödinger equation, we exhibit a supplementary, quasi-instantaneous defocusing contribution missing in the weak-field model of polarization. We show that this effect is far from being negligible in particular when closures of ionization channels occur and stems from the interaction of electrons with their parent ions. It provides an interpretation to higher-order Kerr effect recently observed in various gases.

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