Influence of barrier suppression in high-order harmonic generation.
Influence of barrier suppression in high-order harmonic generation.
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DOI：
10.1103/physreva.51.4746
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发表时间：
1995-06
期刊：
影响因子：
--
通讯作者：
Pablo Moreno;L. Plaja;Victor Malyshev;Luis Roso
中科院分区：
文献类型：
--
作者：
Pablo Moreno;L. Plaja;Victor Malyshev;Luis Roso
在隧道效应是电子从核心喷射的基本过程的情况下，伴随光电离的高次谐波产生呈现出清晰的平台结构。我们在这里描述当激光强度如此高以至于势垒抑制开始成为主要机制时预期会发生什么。我们表明，这是一种电离状态，其中谐波产生随着强度而减少，因此获得高谐波产生的实际上限。因此，我们能够预测谐波截止出现的能量低于标准 ${\mathit{I}}_{\mathit{P}}$+3.17${\mathit{U}}_{\mathit{P}}$ 定律预期的能量，其中 ${\mathit{I}}_{\mathit{P}}$ 和 ${\mathit{U}}_{\mathit{P}}$ 相应地是基态电子的电离阈值和有质动力能量。
High-order harmonic generation accompanying photoionization presents a clear plateau structure in situations where tunneling is the fundamental process for the ejection of the electron from the core. We describe here what is expected to happen when the laser intensity is so high that barrier suppression begins to be the dominant mechanism. We show that this is an ionization regime where harmonic generation decreases with intensity, obtaining therefore an upper practical limit for high harmonic generation. Thus we are able to predict situations where the harmonic cutoff appears at a lower energy than that expected by the standard ${\mathit{I}}_{\mathit{P}}$+3.17${\mathit{U}}_{\mathit{P}}$ law where ${\mathit{I}}_{\mathit{P}}$ and ${\mathit{U}}_{\mathit{P}}$ correspondingly are the ionization threshold for an electron in the ground state and ponderomotive energy.