Attosecond electron bunches
Attosecond electron bunches
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DOI：
10.1103/physrevlett.93.195003
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发表时间：
2004-11-05
影响因子：
8.6
通讯作者：
Mourou, G
中科院分区：
文献类型：
--
作者：
Naumova, N;Sokolov, I;Mourou, G
持续时间为阿秒的电子聚束可以与激光束相干地相互作用。我们展示了p偏振的超强激光脉冲与过密等离子体的尖锐边界相互作用如何产生这样的聚束。粒子模拟表明，阿秒束流产生脉冲传播过程中通过一个薄的通道或在掠入射过程中的等离子体层。在等离子体中，由于电子轨迹的自相交，电子浓度突然达到峰值。一组逆流电子通过电磁场中的零点被推离等离子体，继承了峰值电子密度分布，并在真空中形成相对论性超短聚束。
Electron bunches of attosecond duration may coherently interact with laser beams. We show how p-polarized ultraintense laser pulses interacting with sharp boundaries of overdense plasmas can produce such bunches. Particle-in-cell simulations demonstrate attosecond bunch generation during pulse propagation through a thin channel or in the course of grazing incidence on a plasma layer. In the plasma, due to the self-intersection of electron trajectories, electron concentration is abruptly peaked. A group of counterstream electrons is pushed away from the plasma through nulls in the electromagnetic field, having inherited a peaked electron density distribution and forming relativistic ultrashort bunches in vacuum.