激光预脉冲对双层靶LPX辐射特性的影响

Effect on LPX radiation characteristics with a laser prepulse irradiated binary-layer target

以激光产生的等离子体作为短波激光的激活介质,是目前实现X射线激光最有希望的方案之一,早在1985年,美国利弗莫尔国家实验室(LLNL)的D.L.Matthaws等人首次观察到了硒等离子体介质中类氖离子的20.9nm和20.6nm跃迁的短波激光输出,这给许多实验室X射线激光研究带来了新的生机。继后许多实验报道了他们利用各种机制所取得的结果,目前认为最有希望的泵浦机制是电子碰撞激发和碰撞复合,相应地它们对激光条件和靶的结构要求是不同的。为此,我们在文献[3]中已较系统地研究了激光与高、中和低Z元素靶相互作用的辐射特性,在文献[4]中研究了激光产生的等离子体基本参数和分布特性,在文献[1]中研究了不同结构靶对短波域粒子数反转的影响。本文是在上述工作的基础上。

The effect on LPX radiation characteristics with a laser irradiating binary-layer (Au-Al) target is presented with or without a prepulse in this paper. It shows that abundant spectral lines of H-like aluminium ions and a varitey of impurity spectral linesemitting from the inner layer of Al are observed with a high spectral resolution due to the narrow linewidths. While without prepulse and the thickness of the outer layer of Au coated more than 200nm, only gold spectral lines emitted from the outer layer of Au are observed.