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Modeling of femtosecond ablation of aluminum film with single laser pulses

机译:飞秒消融铝膜的单激光脉冲建模

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摘要

Detailed investigation of pulsed laser ablation dynamics is performed for aluminum target under action of 100 fs pulses with peak intensity 3.95 × 10~(12) W/cm~2 and wavelength 0.8μm.Non-equilibrium two-temperature model with hydrodynamic Stephan problem was used for modeling. Explicit tracking of moving interphase boundaries permits exact determination of their velocity and amount of removed and evaporated material. Detailed ablation process is analyzed using the study of temperature, pressure and density evolution in the target. High phase front velocities (melting up to 5 km/s and evaporation up to 350 m/s) are caused by strong overheating of solid and liquid phases.
机译:在100 fs脉冲作用下,对铝靶材进行了脉冲激光烧蚀动力学的详细研究,峰值强度为3.95×10〜(12)W / cm〜2,波长为0.8μm。具有流体动力学Stephan问题的非平衡两温模型。用于建模。明确跟踪移动的相间边界可以准确确定其速度以及去除和蒸发的物质的量。通过研究目标中的温度,压力和密度演变来分析详细的消融过程。固相和液相强烈过热导致较高的相前速度(融化速度高达5 km / s,蒸发速度高达350 m / s)。

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