Influence of pre-pulse and main pulse energies on the resonant harmonic from Gallium laser-ablation plumes

IF 1.5

Fundamental Plasma Physics Pub Date : 2026-03-01 Epub Date: 2026-02-12 DOI:10.1016/j.fpp.2026.100110

Ramin Ghahri Shirinabadi , Feng Zhu , Mangaljit Singh , Romain Marcelino , Antoine Laramée , Tsuneyuki Ozaki

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Abstract

We investigate the underexplored multiphoton ionization regime of resonantly enhanced harmonic generation in gallium laser-ablation plumes. Resonant harmonics generate quasi-monochromatic extreme ultraviolet radiation with a pronounced coherent intensity enhancement. In this experimental study, we systematically examine high-order harmonic generation yield by independently varying the energies of the pre-pulse, which forms the laser-ablation plume, and the main pulse, which drives the harmonic emission. This approach enables precise evaluation of how each pulse contributes to the overall efficiency of resonant harmonic generation. Throughout this study, we identify the optimal conditions for maximizing the generation efficiency of gallium resonant harmonics driven by a 400 nm laser. Our results demonstrate an effective method for generating intense, quasi-monochromatic femtosecond extreme ultraviolet radiation and offer valuable insight into the role of autoionizing resonances within the multiphoton ionization regime.

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预脉冲和主脉冲能量对镓激光烧蚀羽流谐振谐波的影响

我们研究了镓激光烧蚀羽流中共振增强谐波产生的未被充分探索的多光子电离机制。共振谐波产生具有明显相干强度增强的准单色极紫外辐射。在本实验研究中，我们通过独立改变形成激光烧蚀羽流的预脉冲和驱动谐波发射的主脉冲的能量，系统地研究了高次谐波产生的产率。这种方法可以精确地评估每个脉冲对谐振谐波产生的总体效率的贡献。在整个研究中，我们确定了最大化400 nm激光驱动镓谐振谐波产生效率的最佳条件。我们的研究结果证明了一种产生强烈的准单色飞秒极紫外线辐射的有效方法，并为多光子电离机制中自电离共振的作用提供了有价值的见解。

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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Fundamental Plasma Physics

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