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arXiv 1404.6180physics.atom-ph
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隧道区以外高强度laser下的高次谐波产生

High-order harmonic generation at high laser intensities beyond the tunnel regime

J. A. Pérez-Hernández, M. F. Ciappina, M. Lewenstein, A. Zaïr, L. Roso

摘要:

我们目前的研究高次谐波产生(HHG)在激光强度远高于饱和。我们使用的驱动激光脉冲,提出了一个特定的电子动力学在打开阶段。我们的结果预测的谐波产额增加后,最初的下降,当激光强度增加。这一事实与普遍认为的谐波发射在1000强时会逐渐退化的观点相矛盾。我们已经确定了一组特定的轨迹,出现在这些奇异的激光脉冲的开启阶段,负责在这个高强度制度的谐波效率的意外增长。我们的研究结合了两种互补的方法:经典分析和全量子力学计算所产生的数值积分的3维时间相关的薛定谔方程补充时频分析。

英文摘要:

We present studies of high-order harmonic generation (HHG) at laser intensities well above saturation. We use driving laser pulses which present a particular electron dynamics in the turn-on stage. Our results predict an increasing on the harmonic yield, after an initial dropping, when the laser intensity is increased. This fact contradicts the general belief of a progressive degradation of the harmonic emission at ultrahigh intensities. We have identified a particular set of trajectories which emerges in the turn-on stage of these singular laser pulses, responsible of the unexpected growth on the harmonic efficiency at this high intensity regime. Our study combines two complementary approaches: classical analysis and full quantum mechanical calculations resulting from the numerical integration of the 3-dimensional time-dependent Schrödinger equation complemented with the time-frequency analysis.

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