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Dependence of radiation decay constant of laser produced copper plasma on focal position

机译:激光产生铜等离子体辐射衰减常数对焦点位置的依赖性

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摘要

Laser-induced copper plasma is investigated experimentally and theoretically. Laser-induced plasma on the surface of the copper sample is generated by focusing a nanosecond (similar to 7 ns) laser pulse. The experiment is performed in the ambient atmosphere at three different focal positions (lens to sample distances). The main objective of this work is to investigate the effect of the focal position on the radiation decay constant of the plasma. Experimental data are used for estimating the plasma temperature, electron density, ablated mass, and radiation decay constant. It is shown that these parameters essentially depend on the focal position with respect to the sample surface. The theory of relaxation of radiation is considered for the kinetic evolution of the plasma. The results of the theory are compared with the obtained experimental data.
机译:通过实验和理论地研究激光诱导的铜等离子体。 通过聚焦纳秒(类似于7ns)激光脉冲来产生激光诱导的等离子体在铜样品的表面上产生。 实验在三个不同的焦点位置(镜片到样品距离)的环境气氛中进行。 这项工作的主要目的是研究焦点位置对血浆的辐射衰减常数的影响。 实验数据用于估计等离子体温度,电子密度,烧蚀质量和辐射衰减恒定。 结果表明,这些参数基本上取决于相对于样品表面的焦点位置。 辐射的放松理论被认为是血浆的动力学演变。 将该理论的结果与获得的实验数据进行比较。

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