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为研究激光烧蚀靶产生冲量过程和机理,建立了一个复杂的一维热传导和流体动力学模型.以空间碎片常见材料Al为例,用建立的模型数值计算了纳秒脉宽激光烧蚀靶产生的冲量及冲量耦合系数随时间变化情况.数值结果和已有的实验数据符合的较好.数值计算表明:激光脉冲时间内,靶获得的冲量随时间迅速增加,在脉冲时间结束后,冲量变化随时间趋于稳定;在冲量耦合过程中,烧蚀等离子体向真空膨胀,羽流尺度逐渐增大,同时吸收入射激光能量,导致激光与靶耦合的能量降低.
In order to study the process and mechanism of impulse generation in laser ablation target, a complex one-dimensional model of heat conduction and fluid dynamics was established. Taking Al, a common material in space debris, as an example, the numerical simulation of nanosecond pulse width laser ablation target The numerical results agree well with the existing experimental data.The numerical results show that the target impulse increases rapidly with time within the laser pulse time, and after the pulse time expires, the impulse During the process of impulse coupling, the ablated plasma expands into vacuum and the scale of plume increases gradually. At the same time, the incident laser energy is absorbed and the energy of laser-target coupling decreases.