纳秒脉冲激光诱导的金属膜喷发的分布特征

大功率纳秒脉冲激光辐照金属膜层时会发生热力损伤,产生的高温和高压会引起金属膜层的热蒸发,从而向外喷射颗粒,大多数喷射粒子处于原子和离子状态。在能量色散光谱分析测试中,文中使用多组标准样品进行比较实验,校准测试结果,并给出了一种根据结果计算沉积原子数的估计方法。此外,在此基础上比较了不同真空度的真空环境和大气环境下铝膜喷发的差异,并且对比了不同熔点的金属膜的喷发及空间分布特征。通过结合泵探测技术捕获的瞬态图像,进一步分析和解释了实验结果。

Distribution characteristics of metal film eruption induced by nanosecond pulse laser

Thermo-mechanical damage occurs when a metal film layer is irradiated by a high-power nanosecond pulse laser.High temperature and high pressure induce the thermal evaporation of the metal film layer and particles outward ejection.Most of the ejected particles are in atomic and ionic states.In the energy dispersive spectroscopy analysis test,multiple sets of standard samples for comparison experiments was used to calibrate the test results in this paper,and an estimated method was given to calculate the number of deposited atoms based on the results.The differences of the eruption of A1 film under different vacuum environments and atmospheric environments irradiated by different laser fluences were compared.And the eruption and spatial distribution characteristics of metal films with different melting points were compared.The experimental results were further analyzed and explained by combining the transient images captured by pump-probe technology.