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arXiv 1012.4504physics.atom-ph
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描述强laser场中原子的强场近似的准静态极限：圆极化

Quasistatic limit of the strong-field approximation describing atoms in intense laser fields: Circular polarization

J. H. Bauer

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12 pages, 4 figures; submitted to Physical Review A
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摘要：

在Vanne和Saenz [Phys.Rev.A75，063403（2007）]最近的工作中，导出了描述暴露于线性偏振激光场的原子或分子系统的电离率的速度规范强场近似的准静态极限。结果表明，在低频极限的电离率是成比例的激光频率（对于恒定强度的激光场）。在目前的工作中，我表明，圆偏振激光场的电离率是成正比的激光频率的较高的权力为类氢原子。新的解析表达式的渐近电离率（成为准确的准静态限制）不包含多光子贡献的总和。对于非常低的激光频率（光学或红外），这些表达式通常保持与速度规范强场近似的数量级一致。

英文摘要：

In the recent work of Vanne and Saenz [Phys. Rev. A 75, 063403 (2007)] the quasistatic limit of the velocity gauge strong-field approximation describing the ionization rate of atomic or molecular systems exposed to linearly polarized laser fields was derived. It was shown that in the low-frequency limit the ionization rate is proportional to the laser frequency (for a constant intensity of the laser field). In the present work I show that for circularly polarized laser fields the ionization rate is proportional to higher powers of the laser frequency for hydrogenic atoms. The new analytical expressions for asymptotic ionization rates (which become accurate in the quasistatic limit) contain no summations over multiphoton contributions. For very low laser frequencies (optical or infrared), these expressions usually remain with an order-of-magnitude agreement with the velocity gauge strong-field approximation.

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