空气中YAG激光诱导Cu等离子体空间特性的研究

在空气中利用Nd: YAG脉冲激光诱导金属Cu靶，产生激光等离子体羽，并获得等离子体羽的空间谱；研究了空间谱线结构；分析了不同空间位置处电子温度和电子密度的空间演化规律；并对等离子体光谱的特性和产生机制进行了讨论. 结果表明：谱线结构、谱线强度和等离子体的电子温度及电子密度都与空间位置变化密切相关，特征谱强度最大值出现在距靶面0.75-1.0mm的空间位置处，此处CuⅠ谱线相对强度最强，在1.25 mm空间位置处电子温度比周边的电子温度偏低，但此处电子密度反而升高，这种现象可以由级联效应得到解释。

The Research of YAG Laser-Induced Cu Plasma Spectra on Space Characteristic in Air

The plasma spectra have been measured with a pulsed Nd: YAG laser which induces plasma from a metal copper target in air. And the space-resolved spectra of the plasma are obtained. Varying space distance the spectral structure and electron temperature and electron intensity in various space distances from the target are studied. And the plasma spectrum characteristics and mechanism of production are discussed. The results show that the spectral structure and spectral intensity and plasma electron temperature and density are closely related with spatial variation. characteristic spectrum strength maximum value appears at 0.75-1.0 mm space position before target, here Cu line relative strength strongest. at 1.25 mm space position electronic temperature is lower, and the electron density instead increases, and this phenomenon can be interpreted by the cascade effect