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.

提出了一种单发实验测量软X射线波段多层膜反射镜反射特性的简易方法。实验采用激光等离子体软X射线源作为光源,用平焦场光栅谱仪分光,在光路中引入掠入射镜以消除高级次谱的影响,用软X光CCD记录,在一发激光打靶实验中,测量了设计中心波长为13.9nm的Mo/Si多层膜反射镜的反射特性。

由复数矩阵元表达的失调光学系统衍射积分,研究了部分相干光交叉谱密度经过复杂光学系统的传输规律,并将之用于无腔型激光输出特性的研究。具体对实验室等离子体X射线激光进行了分析,所得结果与已有实验符合较好。

采用矩阵光学方法,研究了串接多靶、弯曲靶加反射镜“双程放大”X射线激光输出特性,给出了发散角普遍公式,分析了电子密度梯度分布、反射镜角度失调对X射线激光输出场分布的影响,所得结果与已有实验符合得较好。最后,对如何从靶、X光学元件空间排布来实现近衍射极限的输出发散角提出了新的设想,并作了半定量的探讨。

采用在平焦场光栅谱仪后面分段记录光谱的办法成功地实现了软X光多层膜反射镜反射率的测量,实验观察了反射镜反射特性随入射角变化情况,同时对实验测量误差进行了分析。

运用透射光栅光谱仪,对线聚焦高功率激光辐照到锗靶上产生的软X光激光进行光谱记录,利用衍射谱的对称性和已经绝对标定过的Kodak-101底片来完成对Kodak-SWR底片的绝对标定.