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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Collinear dual-pulse laser optical breakdown and energy deposition
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Collinear dual-pulse laser optical breakdown and energy deposition

机译：共线双脉冲激光光学击穿和能量沉积

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A non-equilibrium model for laser-generated plasmas is used to represent collinear dual nano-second-pulse interactions. In the specific case considered, the breakdown is initiated with an ultraviolet (UV) laser pulse at 266 nm, which pre-ionizes the gas, and it is followed by a near-infrared (NIR) pulse at 1064 nm, which deposits significant energy into the ionized mixture. The model is validated against corresponding experiments, and simulation results are interrogated to understand key features of the plasma-kernel dynamics and the post-discharge hydrodynamics. The hydrodynamics of the non-equilibrium plasma is governed by the two-temperature Navier-Stokes equations accounting for both multiphoton ionization and inverse bremsstrahlung. The interaction between the laser beam and the plasma is modeled based on the radiative transfer equation. The temporal and spatial offsets of the two pulses can generate ionization kernels with different topology and dynamics. It is shown that the UV pre-ionization pulse can tailor the plasma region, leading to a larger ionized volume than would occur for a single-pulse breakdown, and it increases the efficiency of the energy deposition for the following NIR discharge. Vorticity in the early post-discharge phase is generated via baroclinic torque from the misalignment of the radial gradient of density (sudden gas expansion) and the strong pressure gradient (initiated by energy deposition from the laser beam). It is predicted that the collinear dual pulse can be designed to specify the plasma kernel size, shape, and maximum temperature in the breakdown phase, and the initial post-breakdown vorticity and plasma-core decay.
机译：激光产生的等离子体的非平衡模型用于表示共线纳米第二脉冲相互作用。在考虑的具体情况下，用紫外（UV）激光脉冲以266nm的紫外（UV）激光脉冲引发，该激光脉冲预先电离气体，然后在1064nm处接下来是近红外（NIR）脉冲，其沉积显着的能量进入电离的混合物。该模型针对相应的实验验证，询问模拟结果以了解等离子体 - 内核动力学和后排出后流体动力学的关键特征。非平衡等离子体的流体动力学受到两温纳维尔 - 斯托克斯方程的管辖，占多选电离和逆Bremsstrahlung。基于辐射传输方程建模激光束和等离子体之间的相互作用。两个脉冲的时间和空间偏移可以产生具有不同拓扑和动态的电离核。结果表明，UV预热脉冲可以定制等离子体区域，导致比单脉冲击穿的更大的电离量，并且它增加了下列NIR放电的能量沉积的效率。早期排出阶段的涡流通过曲冠状扭矩从密度（突然气体膨胀）和强大的压力梯度（通过激光束的能量沉积引发）的径向梯度而产生。预测，共线双脉冲可以设计成在击穿阶段中的等离子体粒尺寸，形状和最大温度，以及初始击穿后涡度和等离子体芯腐烂。

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