论文标题
超微秒飞秒激光脉冲辐射的亚微米固体靶标发射的Terahertz发射
Terahertz emission from submicron solid targets irradiated by ultraintense femtosecond laser pulses
论文作者
论文摘要
使用高分辨率的二维粒子中的模拟，我们从数值上调查了由超过超过超轻义驱动的亚微米 - 厚碳固体箔（$ \ sim 10^{20} {20}} \，\ rm w \，cm^{ - 2} $），$ 30 $ 30 \ $ 30 \ $ 30 \ $ 30.正常发病率。所考虑的目标厚度范围延伸至相对论透明度状态，该方案已知可以优化飞秒激光脉冲的离子加速度。通过纵向和横向电流散发出的田地，我们的分析表明，在相互作用后的第一个皮秒中，THz发射由于连贯的过渡辐射而导致通过循环热电子和天线型发射的相干过渡辐射，而屏蔽电子电流通过沿快速扩增的屏蔽电子电流传播。
Using high-resolution, two-dimensional particle-in-cell simulations, we investigate numerically the mechanisms of terahertz (THz) emissions in submicron-thick carbon solid foils driven by ultraintense ($\sim 10^{20}\,\rm W\,cm^{-2}$), ultrashort ($30\,\rm fs$) laser pulses at normal incidence. The considered range of target thicknesses extends down to the relativistic transparency regime that is known to optimize ion acceleration by femtosecond laser pulses. By disentangling the fields emitted by longitudinal and transverse currents, our analysis reveals that, within the first picosecond after the interaction, THz emission occurs in bursts as a result of coherent transition radiation by the recirculating hot electrons and antenna-type emission by the shielding electron currents traveling along the fast-expanding target surfaces.
