烧蚀等离子体高次谐波辐射的飞秒包络
Femtosecond envelope of the high-harmonic emission from ablation plasmas
摘要：
我们的特征的时间轮廓的高阶谐波发射烧蚀等离子体羽流使用交叉相关与红外（IR）激光束提供的2-光子谐波+红外电离稀有气体原子。我们研究了非共振等离子体（铅，金和铬）和共振等离子体（铟和锡），即等离子体中的单电荷离子呈现出强辐射跃迁符合谐波阶。发现所有谐波阶数和所有等离子体目标的互相关迹线非常相似。恢复的谐波脉冲持续时间是非常相似的驱动激光，有一个趋向于更短，表明即使在谐振谐波的情况下，发射是一个\stef{directly}激光驱动的过程。这为描述谐振谐波发射的理论提供了有价值的输入，并为应用打开了非常高通量桌面\textsc{xuv}源的前景。
英文摘要：
We characterize the temporal profile of the high-order harmonic emission from ablation plasma plumes using cross-correlations with the infrared (IR) laser beam provided by 2-photon harmonic+IR ionization of rare gas atoms. We study both non-resonant plasmas (lead, gold and chrome) and resonant plasmas (indium and tin), i.e. plasmas presenting in the singly-charged ions a strong radiative transition coinciding with an harmonic order. The cross-correlation traces are found very similar for all harmonic orders and all plasma targets. The recovered harmonic pulse durations are very similar to the driving laser, with a tendency towards being shorter, demonstrating that the emission is a \stef{directly} laser-driven process even in the case of resonant harmonics. This provides valuable input for theories describing resonant harmonic emission and opens the perspective of a very-high-flux tabletop \textsc{xuv} source for applications.
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