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基于1064nm Nd:YAG激光器,对比研究了紫铜和黄铜等离子的特征参数。洛仑兹函数拟合Cu I 324.75nm得到紫铜和黄铜等离子体的电子密度分别是3.6×1017 cm-3和3.3×1017 cm-3。为了减小谱线自发辐射跃迁几率不确定性和测量误差带来的计算误差,采用改进型迭代玻耳兹曼算法精确求解紫铜等离子体和黄铜等离子体的电子温度分别是6316K和6051K,分析表明,两种等离子体特征参数的差异主要是由于黄铜中的锌元素的电离能(9.39eV)大于铜元素的电离能(7.72eV)而造成的。实验数据证实激光诱导的紫铜和黄铜等离子体满足局部热力学平衡模型和光学薄模型。
Based on the 1064nm Nd: YAG laser, the characteristic parameters of copper and brass were compared. The Lorentz function fitted Cu I 324.75 nm to obtain the electron density of the copper and brass plasmas respectively being 3.6 × 10 17 cm -3 and 3.3 × 10 17 cm -3. In order to reduce the calculation error caused by the uncertainty of the probability of spontaneous emission transition and the measurement error, the improved iterative Boltzmann algorithm is used to accurately determine the plasma temperatures of copper plasma and brass plasma respectively at 6316K and 6051K. It is indicated that the difference of the characteristic parameters of the two plasmas is mainly caused by the fact that the ionization energy (9.39eV) of zinc in brass is larger than that of copper (7.72eV). Experimental data demonstrate that laser-induced copper and brass plasmas satisfy local thermodynamic equilibrium models and optical thin models.