单脉冲激光诱导击穿光谱技术(single-shot, LIBS)是一种在国际上被广泛使用的物质及元素检测技术, 具有快速、 准确、 无需样品制备等诸多优点。 为了满足单脉冲LIBS的实验要求, 实验用激光器的选取是非常重要的, 它直接关系到诱导激光的强度以及脉冲宽度的大小, 而这些又对实验结果产生深刻的影响。 因此, 选取正确的激光器, 是单脉冲LIBS成功的关键。 正是基于这个目的, 比较了不同波长、 不同激光能量的激光脉冲作用下, 纯铅发射光谱的定量变化, 对于单脉冲LIBS中激光器的选取有着很好的借鉴意义。

Single-shot laser induced breakdown spectroscopy (single-shot LIBS) has become one of the most important branches of material detection. The present article mainly focuses on analysis of the emission spectra of lead by quantitative methods. In the experiment, both qualitative and quantitative analysis are made to detect the content of lead in different material using single-shot LIBS with Q-switched Nd:YAG lasers whose pulse width is 10ns. In quantitative analysis, detections of the emission lines of pure lead with different pulse energies: 107, 139.2 and 171.5 mJ and different wavelengths: 1 064, 532 and 1 064/532 nm are made. Spectra under three conditions (1: same wavelengths and different pulse energies for single pulse lasers; 2: same pulse energy and different wavelength for single pulse lasers and 3: same wavelengths and different pulse energies for double pulse lasers) are acquired and compared.