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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Laser fluence effects on ion emission from a laser-generated Cu plasma
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Laser fluence effects on ion emission from a laser-generated Cu plasma

机译：激光能量密度对激光产生的铜等离子体中离子发射的影响

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摘要

We present details of an experimental facility developed for the diagnostics of highly charged ions produced during pulsed laser ablation of solid targets. A range of laser fluences (2-10 J cm~(-2)) from a Q-switched Nd: YAG laser (wavelength = 1064 nm, pulse duration ～10 ns) was used to generate a copper plasma. The ion diagnostics were based on the time-of-flight (TOF) methods; an ion collector and a 45° parallel plate electrostatic ion energy analyser were used. A channel electron multiplier located 1.31 m away from the Cu target was used to record the energy-resolved TOF ion spectrum. The effect of laser fluence on the total ion charge, average ion energy and charge state distribution was investigated. The estimated threshold fluence for the onset of the plasma was 2.5 J cm~(-2). About four times increase in both average ion energy and total ion charge was observed in the investigated laser fluence range. The maximum attainable charge state of the Cu ions increased from 1+ to ~(7+) with the increase in laser fluence. The correlation between relative abundance of the various ion charge states indicated that the formation of Cu~(n+) occurred through ionization from Cu~((n-1)+) by the impact of fast electrons or by multiphoton interactions
机译：我们介绍了用于诊断固体靶脉冲激光烧蚀过程中产生的高电荷离子的实验设备的详细信息。调Q Nd：YAG激光器（波长= 1064 nm，脉冲持续时间〜10 ns）产生了一定范围的激光通量（2-10 J cm〜（-2）），以生成铜等离子体。离子诊断基于飞行时间（TOF）方法;使用离子收集器和45°平行板静电离子能量分析仪。位于距铜靶1.31 m处的沟道电子倍增器用于记录能量分辨的TOF离子光谱。研究了激光能量密度对总离子电荷，平均离子能量和电荷态分布的影响。血浆开始的估计阈值通量为2.5 J cm〜（-2）。在研究的激光通量范围内，平均离子能量和总离子电荷均增加了约四倍。随着激光能量密度的增加，Cu离子的最大可获得电荷态从1+增加到〜（7+）。各种离子电荷态的相对丰度之间的相关性表明，Cu〜（n +）的形成是通过快电子的撞击或多光子相互作用从Cu〜（（n-1）+）电离而发生的。

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