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首页> 外文期刊>Applied Physics >Melting and thermal ablation of a silver film induced by femtosecond laser heating: a multiscale modeling approach
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Melting and thermal ablation of a silver film induced by femtosecond laser heating: a multiscale modeling approach

机译：飞秒激光加热引起的银膜熔化和热剥蚀：一种多尺度建模方法

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摘要

The femtosecond laser pulse heating of silver film is investigated by performing quantum mechanics (QM), molecular dynamics (MD), and two-temperature model (TTM) integrated multiscale simulation. The laser excitation dependent electron thermophysical parameters (electron heat capacity, electron thermal conductivity, and effective electron-phonon coupling factor) are determined from ab initio QM calculation, and implemented into TTM description of electron thermal excitation, heat conduction, as well as electron-phonon coupled thermal energy transport. The kinetics of atomic motion is modeled by MD simulation. Energy evolution of excited electron subsystem is described by TTM in continuum. The MD and TTM are coupled by utilizing the effective electron-phonon coupling factor. Laser heating with varying laser fluences is systematically studied to determine the thresholds of homogeneous melting and ablation. The thermal ablation induced by rapid expansion of locally and excessively superheated silver is reported. This paper provides a basis for interpreting the phase-change process induced by laser heating, and facilitates the advancement of femtosecond laser pulse processing of material.
机译：通过执行量子力学（QM），分子动力学（MD）和二温模型（TTM）集成多尺度模拟研究了飞秒激光脉冲加热银膜的过程。激光激发相关的电子热物理参数（电子热容量，电子热导率和有效电子-声子耦合因子）是从头算QM计算确定的，并已实现为电子热激发，热传导以及电子声子耦合热能传输。原子运动的动力学通过MD模拟进行建模。 TTM连续描述了激发电子子系统的能量演化。通过利用有效的电子-声子耦合因子来耦合MD和TTM。系统研究了具有不同激光注量的激光加热，以确定均匀熔化和烧蚀的阈值。据报道，由于局部和过热银的快速膨胀而引起的热消融。本文为解释激光加热引起的相变过程提供了依据，并为飞秒激光材料脉冲处理的发展提供了便利。

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  • 来源
    《Applied Physics》 |2017年第10期|535-548|共14页
  • 作者

    Pengfei Ji; Yuwen Zhang;

  • 作者单位

    Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211, USA;

    Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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