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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Femtosecond laser ablation of nickel in vacuum
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Femtosecond laser ablation of nickel in vacuum

机译：飞秒激光在真空中烧蚀镍

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摘要

We present an experimental characterization and a theoretical analysis of ultrashort laser ablation of a nickel target, which highlights the more general and peculiar features of femtosecond (fs) laser ablation of metals. The study has been carried out by using visible (527 nm) laser pulses of approximate to 300 fs duration. The vacuum expansion dynamics of the ablated species has been investigated by using fast photography and optical emission spectroscopy, while the fs laser pulse-metal interaction has been studied theoretically by means of molecular dynamics simulations. Special attention has been given to the study of the dependence of ablation depth on laser fluence, which has been carried out by comparing the SEM analysis of micro-holes drilled into the nickel samples with the predictions of the theoretical model. The main outcomes of our investigation, which are very satisfactorily reproduced and accounted for by the theoretical model, are (i) the nonlinear dependence of the ablation yield on the laser fluence, and its reliance to the electron heat diffusion, in the process of redistribution of the absorbed energy, (ii) the splitting of the material blow-off into two main classes of species, atoms and nanoparticles, characterized by different expansion dynamics, and (iii) the different degrees of heating induced by the laser pulse at different depths into the material, which causes the simultaneous occurrence of various ablation mechanisms, eventually leading to atoms and nanoparticles ejection.
机译：我们介绍了镍靶材的超短激光烧蚀的实验表征和理论分析，突出了飞秒（fs）激光烧蚀金属的更一般和特殊的功能。通过使用大约300 fs持续时间的可见（527 nm）激光脉冲进行了研究。通过快速摄影和发射光谱研究了消融物质的真空膨胀动力学，同时通过分子动力学模拟从理论上研究了fs激光脉冲-金属相互作用。通过将钻入镍样品中的微孔的SEM分析与理论模型的预测相比较，对烧蚀深度对激光通量的依赖性进行了特别的研究。理论模型令人满意地再现和说明了我们研究的主要结果，即：（i）烧蚀量对激光能量密度的非线性依赖性，以及其在重新分布过程中对电子热扩散的依赖性吸收的能量;（ii）将物料喷出物分为两大类，即原子和纳米颗粒，其特征在于不同的膨胀动力学，以及（iii）激光脉冲在不同深度产生的不同程度的加热进入材料，这会导致同时发生各种烧蚀机制，最终导致原子和纳米粒子弹出。

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