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首页> 外文会议>NATO Advanced Research Workshop on Super-Intense Laser-Atom Physics Sep 24-30, 2000 Han-sur-Lesse, Belgium >QUASISTATIONARY STABILIZATION OF THE DECAY OF A WEAKLY-BOUND LEVEL AND ITS BREAKDOWN IN A STRONG LASER FIELD
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QUASISTATIONARY STABILIZATION OF THE DECAY OF A WEAKLY-BOUND LEVEL AND ITS BREAKDOWN IN A STRONG LASER FIELD

机译：强激光场中弱界能级的衰变的准稳定化

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Although it was pointed out about 10 years ago that an atomic decay rate might decrease as the intensity of a high-frequency laser field increases, there still does not exist any complete understanding of either the physical origin of this interesting nonlinear phenomenon or its dependence on the atomic and field parameters. Essentially, the problem consists in that the phenomenon requires a major modification of the standard picture of photoeffect in a strong laser field. In Ref. the origin of this stabilization is related to a particular distortion of an atomic potential by an intense monochromatic high-frequency field. This phenomenon is called adiabatic or quasistationary stabilization (QS). For the case of Rydberg levels, another (interference) mechanism of QS was suggested. Both theories predict an unlimited decrease of the decay rate (or of the width Γ of an atomic level, i.e., of the imaginary part of he complex quasienergy, ε = Re ε ― iΓ/2)) as the laser field amplitude increases. In recent years the idea of "dynamic stabilization" (DS) has become popular. It originates from the pulse form of a laser field rather than from any intrinsic property of the atom in a strong monochromatic field. Within this model the numerous simulations point also to the possibility of a breaakdown of stabilization for the case of superintense short laser pulses. Ho vever, a recent paper, using the quasistationary quasienergy states (QQES) as an adiabatic basis for the laser pulse has shown that DS has the same (quasistationary) origin as QS. Finally, a number of authors deny the existence of stabilization, in particular, of QS for ionization from a short-range potential(see also [7]) and of DS in pulsed fields. Obviously, these controversies and ambigui-ties are caused by the complexity of the numerical solution of the Cauchy problem for the time-dependent Schroedinger equation in a strong field and by the absence of analyses for exactly solvable analytical models. We analyze below (see also [9]) the exactly solvable problem of an electron in a three-dimensional, short-range potential and consider the two questions: does a QS-like behavior of the decay rate exist for this model, and, if so, is there an upper intensity limit of the QS regime?
机译：尽管大约10年前指出，随着高频激光场强度的增加，原子的衰变率可能会降低，但对于这种有趣的非线性现象的物理起源或对它的依赖性的了解仍然不完整。原子和场参数。本质上，问题在于该现象需要在强激光场中对光效应的标准图像进行重大修改。在参考文献中这种稳定的起源与强烈的单色高频场对原子势的特定扭曲有关。这种现象称为绝热或准稳态（QS）。对于里德伯格水平，提出了另一种（干扰）QS机制。两种理论都预测随着激光场幅度的增加，衰减率（或原子能级的宽度Γ，即复准能量的虚部ε= Reε―iΓ/ 2）将无限下降。近年来，“动态稳定”（DS）的想法已变得流行。它源自激光场的脉冲形式，而不是源自强单色场中原子的任何固有性质。在该模型中，大量仿真还指出，对于超强短脉冲激光，可能会降低稳定性。 Ho vever，最近的一篇论文，使用准平稳准能态（QQES）作为激光脉冲的绝热基础，表明DS与QS具有相同的（准平稳）起源。最后，许多作者否认存在稳定作用，特别是存在用于短距离电离的电离QS（另见[7]）和脉冲场中DS的稳定作用。显然，这些争议和歧义是由于强场中随时间变化的Schroedinger方程的柯西问题的数值解的复杂性以及缺乏对可求解的解析模型的分析所引起的。我们在下面分析（另请参见[9]），在三维短程电势中电子的完全可解决的问题，并考虑两个问题：该模型是否存在类似QS的衰减率行为，并且，如果是，QS制度是否有强度上限？

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