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首页> 外文期刊>Applied optics >Interferometric investigation of the influence of argon buffer gas on the characteristics of laser-induced aluminum plasmas
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Interferometric investigation of the influence of argon buffer gas on the characteristics of laser-induced aluminum plasmas

机译：干涉法研究氩气对激光诱导铝等离子体特性的影响

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An interferometric analysis was performed to investigate the influence of argon (Ar) buffer gas on the characteristics of laser-induced aluminum (Al) plasma at atmospheric pressure. The plasma was produced by focusing a Q-switched Nd:YAG laser pulse (λ = 1064 nm, pulse duration ～5 ns, E = 6.0 mJ) onto an Al target. The interference patterns were constructed using a Nomarski interferometer incorporated with a frequency-doubled, Q-switched Nd:YAG laser (λ = 532 nm, pulse duration ～10 ns) that generates an interferometric probe beam. The interferometric measurements were carried out as a function of the elapsed time after the onset of breakdown under the conditions of open air and an Ar gas jet flow (5 l/ min). With the injection of an Ar buffer gas jet in the ablation process, an increase in electron density and a preferential axial plasma expansion of the plasma plume were observed during the early stages of plasma formation as a consequence of increased inverse-Bremsstrahlung (IB) absorption efficiency.
机译：进行干涉分析以研究氩气（Ar）缓冲气体在大气压下对激光诱导的铝（Al）等离子体特性的影响。通过将调Q的Nd：YAG激光脉冲（λ= 1064 nm，脉冲持续时间〜5 ns，E = 6.0 mJ）聚焦到Al靶上来产生等离子体。干涉图样是使用Nomarski干涉仪构建的，该干涉仪结合了倍频的Q开关Nd：YAG激光器（λ= 532 nm，脉冲持续时间〜10 ns），产生干涉探测光束。干涉测量是在露天和Ar气体流量（5 l / min）的条件下，根据击穿开始后经过的时间进行的。通过在消融过程中注入Ar缓冲气体射流，在等离子体形成的早期阶段就观察到了电子密度的增加和等离子体羽流的优先轴向等离子体膨胀，这是由于反向Breemsstrahlung（IB）吸收增加所致效率。

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