从laser产生的相对论运动高密度电子层的汤姆逊背散射
Thomson backscattering from laser generated, relativistically moving high-density electron layers
摘要：
我们的实验表明，XUV辐射产生时，激光脉冲汤姆逊背散射的相对论性电子，这是形成在背面的箔照射在其前侧由高强度激光的片材。使用Jena钛：蓝宝石TW激光系统（JETI）实现了全光学设置。主脉冲被分成两个脉冲：一个用于将来自薄铝箔靶的电子加速到大约MeV的能量，另一个用于将反向传播的探测脉冲在这些电子离开靶后侧时从这些电子上反向散射。该过程产生的光子在一个宽的光谱范围内的一些几十eV的结果，广泛的电子能量分布。当探测脉冲在泵浦脉冲照射靶正面后100 fs到达靶背面时，观察到最高的散射强度，对应于相互作用区域的最大热电子通量。这些结果可以提供时间分辨的信息后表面的电子鞘层的演变，因此有关的电场的动态负责从薄，激光照射箔的后表面的离子加速。
英文摘要：
We show experimentally that XUV radiation is produced when a laser pulse is Thomson backscattered from sheets of relativistic electrons which are formed at the rear-surface of a foil irradiated on its front side by a high-intensity laser. An all-optical setup is realized using the Jena Titanium:Sapphire TW laser system (JETI). The main pulse is split into two pulses: one to accelerate electrons from thin aluminum foil targets to energies of the order of some MeV and the other, counterpropagating probe pulse is Thomson-backscattered off these electrons when they exit the target rear side. The process produced photons within a wide spectral range of some tens of eV as a result of the broad electron energy distribution. The highest scattering intensity is observed when the probe pulse arrives at the target rear surface 100 fs after the irradiation of the target front side by the pump pulse, corresponding to the maximum flux of hot electrons at the interaction region. These results can provide time-resolved information about the evolution of the rear-surface electron sheath and hence about the dynamics of the electric fields responsible for the acceleration of ions from the rear surface of thin, laser-irradiated foils.
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