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.

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.