Mechanisms of forward laser harmonic emission from thin overdense plasmas
Mechanisms of forward laser harmonic emission from thin overdense plasmas
复制标题
稀薄过密等离子体的前向激光谐波发射机制
DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
P. Martin
中科院分区：
文献类型：
--
作者：
H. George;F. Quéré;C. Thaury;G. Bonnaud;P. Martin
当高强度激光脉冲撞击薄的固体箔时，可以在该箔的后侧（非照明侧）观察到入射频率的高次谐波。使用数值模拟，我们表明，这些谐波可以产生在前面或后面的目标。我们分析了负责这两种类型的发射的机制，并讨论了它们与在正面检测到的谐波产生中所涉及的机制的联系。对靶两侧光谱的联合测量构成了对超快等离子体动力学的强有力的，但往往是不平凡的探测。
As a high-intensity laser pulse impinges a thin solid foil, high-order harmonics of the incident frequency can be observed at the rear (non-illuminated) side of this foil. Using numerical simulations, we show that these harmonics can be generated either at the front or at the rear side of the target. We analyze the mechanisms responsible for these two types of emission, and discuss their connection with those involved in the generation of harmonics detected on the front side. The combined measurements of spectra on both sides of the target constitute a powerful, but often nontrivial, probe of the ultrafast plasma dynamics.