影响laser诱导击穿光谱的因素综述
An overview of some influential factors in laser-induced breakdown spectroscopy
摘要：
本文介绍了激光诱导击穿光谱（LIBS）中等离子体的形成过程，并对双脉冲LIBS的发射进行了分析，以更好地理解等离子体发射增强的过程和因素。在该分析中，等离子体发射被认为与等离子体密度的平方、等离子体的体积以及第二激光脉冲在由第一激光通过逆韧致辐射吸收过程产生的等离子体羽流中的吸收分数成正比。电子-离子碰撞频率依赖于等离子体的密度和温度，在LIBS中，电子-离子碰撞频率对发射的增强和发射的饱和起着重要的作用。讨论了材料烧蚀、激光延迟、等离子体约束和屏蔽效应等对激光器性能的影响。
英文摘要：
This paper presents the process of plasma formation during laser induced breakdown spectroscopy (LIBS) along with analysis of emission from double pulse LIBS to better understand the processes and the factors involved in enhancement of plasma emission. In this analysis plasma emission has been considered directly proportional to the square of plasma density, its volume, and the fraction of absorption of second laser pulse in the plasma plume produced by the first laser through inverse Bremsstrahlung absorption process. The electron ion collision frequency, which is dependent on the density and temperature of the plasma, has been found playing important role in the enhancement of emission as well as in the saturation of emission during LIBS. The effect of material ablation, delay between lasers, plasma confinement and shielding effect has also been discussed.
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