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用一维粒子模拟程序对功率密度在1022W/cm2以上的超强激光驱动薄膜靶产生的相对论电子层及其经过汤姆孙散射产生的阿秒X射线进行了研究.结果表明,在超相对论强度范围下增大驱动激光强度,相应减小等离子体密度及厚度可使电子层获得更高纵向动量,使汤姆孙散射光明显向更短波长移动.优化相关参数得到了波长为1.168nm的阿秒脉冲.经过对倍频探测光方案与驱动光以及薄膜靶参数进行综合考虑和优化,得到的X射线相干辐射波长有效减小到0.4nm以下,产生的光子能量达到2keV以上.
A one-dimensional particle simulation program was used to study the relativistic electron layer produced by super-laser-driven thin films with a power density above 1022 W / cm 2 as well as the X-ray produced by the Thomson scattering.The results show that in the super-relativistic intensity range The laser intensity is increased and the plasma density and thickness are correspondingly reduced, the higher longitudinal momentum of the electron layer is obtained, so that the scattered light of Tom Sun obviously moves to a shorter wavelength, and the optimal wavelength of the laser is 1.168 nm After comprehensive consideration and optimization of the frequency doubling probe light scheme and the driving light as well as the film target parameters, the obtained X - ray coherent radiation wavelength is effectively reduced below 0.4nm, and the photon energy produced is above 2keV.