皮秒双脉冲LA-LIBS对合金样品的微损元素分析

发布时间：2018-02-25 04:22

  本文关键词： LA-LIBS 双脉冲 元素分析 微损伤　出处：《光谱学与光谱分析》2017年01期 　论文类型：期刊论文

【摘要】：研究了基于一台皮秒Nd∶YAG激光器实现合金样品的双脉冲激光剥离-激光诱导击穿光谱(LALIBS)微损元素分析。实验采用低能量的532nm二倍频激光烧蚀并剥离出微量样品,然后采用较高能量的延时1064nm激光对剥离出的样品进行二次激发,以增强等离子体中的原子辐射强度和提高光谱检测灵敏度。实验分别研究了烧蚀激光脉冲和二次激发光脉冲的能量对信号强度的影响。在烧蚀激光脉冲能量为10μJ,二次激发光脉冲能量为2.5mJ的条件下,LA-LIBS中CuⅠ324.75nm原子谱线的强度与单脉冲LIBS相比改善了86倍,激光烧蚀坑洞的直径小于10μm。研究表明:基于一台皮秒Nd∶YAG激光器,采用双脉冲LA-LIBS技术可以较好地实现对固体样品的微损元素分析。该技术在贵重样品分析和高空间分辨的二维元素显微分析中具有一定的应用价值。
[Abstract]:The micro-loss element analysis of alloy samples based on a picosecond Nd:YAG laser has been studied. The low energy 532 nm double frequency laser ablation and stripping of trace samples have been carried out by means of laser stripping and laser-induced breakdown spectroscopy (LLIBS). Then the laser with a high energy delay of 1064nm was used to excite the peeled sample twice. In order to enhance the atomic radiation intensity in plasma and improve the spectral detection sensitivity, the effects of the energy of ablated laser pulse and secondary excited laser pulse on the signal intensity were studied experimentally. The intensity of Cu 鈪，

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