X-ray spectra have been produced on "Shenguang II" multi-beam laser facility, in which the flat gold target was irradiated by array lens smoothing 0.53μm laser beam. The absolute conversion efficiency ξ_x is reported from the incident laser light energy to x-ray photons for laser-produced plasmas. The characterization of backlighting line sources having photon energies from 1.8 to 3.1 kev are studied under multi-beam laser driving target condition. Quantitative x-ray spectra and energies spectral distribution have been obtained as a function of laser power density and x-ray emission angle.

在"神光II"多束高功率激光装置上利用列阵透镜匀滑钕玻璃波长0.53μm的强激光幅照平面金(Au)靶时产生X射线,本文给出了X射线绝对转换效率ξχo.研究了多束倍频激光叠加驱动靶形成X射线背景光源辐射金M壳层1.8-3.1Kev带谱的特性,获得了不同激光功率密度及不同角度驱动靶面等几种条件下X射线能谱的定量测量结果和能谱分布.

Being aimed at the condition with ultra nonuniform of near field distribution from "Shenguang Ⅱ" (with none laser intensity in large area), by use of the uniform technique of lens array and by the optimizing design for the system combined with principal focal lens and small lens array, a large spot uniform irradiation on target surface has been realized, also a shock illuminant signal with good planarity in large region is obtained while it drives an aluminium plane target.

利用小透镜列阵均匀化技术,针对"神光-Ⅱ"出射光束近场光强特殊分布(有大面积光强为零的区域)的情况,通过对主聚焦透镜及小透镜列阵组合系统的优化设计,实现了靶面光强的大光斑均匀辐照,并利用其驱动平面铝靶,获得了具有大范围良好平面性的冲击波发光信号.