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首页> 外文期刊>Physics of plasmas >Early-stage plasma dynamics with air ionization during ultrashort laser ablation of metal
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Early-stage plasma dynamics with air ionization during ultrashort laser ablation of metal

机译：金属超短激光烧蚀过程中空气电离的早期等离子体动力学

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In this study, the early-stage plasma evolution generated by an ultrashort laser pulse is investigated through pump-probe shadowgraph measurements and simulations. The measurements are performed to show the evolution of the plasma front, while the simulation model is used to further investigate the evolution process and mechanism. Specifically, the laser pulse propagation in air is simulated using the beam propagation method with the slowly varying envelope approximation. The lattice dynamics, the electron dynamics and the multi-scattering event, and the evolution of charged particles (free electrons and ions), are simulated using a molecular dynamics method, a Monte Carlo method, and a particle-in-cell method, respectively. With this simulation model, the refractive index and plasma evolutions are calculated and compared with measured results to validate the simulation model. Different plasma expansion processes, caused by the air ionization, are found with the focal point slightly above and below the target. Air ionization occurs in both cases, but their primary mechanisms are shown to be different.
机译：在这项研究中，通过泵浦探针阴影图测量和模拟研究了由超短激光脉冲产生的早期等离子体演化。进行测量以显示等离子体前沿的演化，同时使用仿真模型进一步研究等离子体的演化过程和机理。具体而言，使用光束传播方法以缓慢变化的包络近似模拟空气中激光脉冲的传播。分别使用分子动力学方法，蒙特卡罗方法和粒子内方法模拟了晶格动力学，电子动力学和多重散射事件以及带电粒子（自由电子和离子）的演化。 。利用该仿真模型，可以计算出折射率和等离子体演化，并与测量结果进行比较以验证仿真模型。发现由空气电离引起的不同等离子体膨胀过程，其焦点在目标的上方和下方。两种情况下都会发生空气电离，但显示出它们的主要机理是不同的。

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