The Dynamics of Dense Plasmas Produced by Ultra-Short Pulse Lasers

D. Umstadter, R. Freeman, H. Milchberg, T. Mcilrath
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引用次数: 1

Abstract

The interaction of an ultra-short pulse high intensity laser with a solid target is of current interest because the resulting plasma is also solid density. Such a plasma might be a bright short pulse continuum x-ray source [1] to pump an x-ray laser or probe transient properties such as phase transitions or biological phenomena [2]. Recent experiments [3] have revealed that these plasmas are good continuum emitters and that the continuum x-ray duration is sub-picosecond (streak camera limited). The x-ray pulse width is primarily determined by the rate at which the electrons and the ionization stages cool from the diffusion of heat into the solid and the expansion of material into the vacuum. In the following we report the results of a one dimensional fluid code that models the interaction of an ultra-short laser pulse with a solid target of Aluminum. We describe the dynamics of the mass density, pressure, ionization and expansion velocity. In a related paper we discuss the effects of these quantities on the pulse width of continuum x-ray radiation generated by recombination [4].
超短脉冲激光产生的致密等离子体动力学
超短脉冲高强度激光与固体目标的相互作用是当前的研究热点,因为产生的等离子体也是固体密度。这样的等离子体可能是一个明亮的短脉冲连续x射线源[1],用于泵送x射线激光器或探测相变或生物现象等瞬态特性[2]。最近的实验[3]表明,这些等离子体是良好的连续辐射体,连续x射线持续时间为亚皮秒(条纹相机限制)。x射线脉冲宽度主要取决于电子和电离阶段因热扩散到固体和物质膨胀到真空而冷却的速率。在下面,我们报告了一维流体代码的结果,该代码模拟了超短激光脉冲与铝固体目标的相互作用。我们描述了质量密度、压力、电离和膨胀速度的动力学。在一篇相关的论文中,我们讨论了这些量对复合产生的连续x射线辐射脉宽的影响[4]。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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