激光诱导紫铜等离子体过程中的逆韧制辐射效应

Inverse bremsstrahlung effect in process of laser-induced copper plasma

摘要: 为了研究激光等离子体相互作用过程中逆韧制辐射效应，用1064nm Nd：YAG激光器诱导产生紫铜等离子体，建立3条铜原子谱线的Boltzmann图，计算得到紫铜等离子体的电子温度为6902K。通过测量铜原子谱线324.75nm的Stark展宽，计算得到紫铜等离子体的电子密度为3.6×1017cm-3；基于铜等离子体的特征参量，得到紫铜等离子体的逆韧制辐射系数是0.021cm-1。结果表明，该光谱分析方法可以在避免对等离子体产生扰动的情况下，得到等离子体的特征参量。

Abstract: In order to study inverse bremsstrahlung (IB) effect in process of laser-induced copper plasma, copper plasma was induced by Nd：YAG laser at 1064nm. The electron temperature 6902K of the copper plasma was calculated with the Boltzmann plot of 3 Cu Ⅰ lines. By measuring the Stark broadening of Cu Ⅰ at 324.75nm, its electron density of 3.6×1017cm-3 was obtained. Based on these characteristic parameters of copper plasma, the inverse bremsstrahlung coefficient of 0.021cm-1 was obtained. Experimental results show that the plasma parameters can be obtained without any disturbance with the spectral analysis method.