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Time-resolved characteristics of laser induced breakdown spectroscopy on non-flat samples by single beam splitting

机译：单束分裂时激光诱导击穿光谱对非平面样本的时间分辨特性

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A single-beam-splitting approach was used to enhance the signal intensity of LIBS under the extreme conditions of laser beam grazing of the surface of non-flat samples. Time-resolved spectra show that the laser-ablated plasma presents a stronger spectral intensity and a slower plasma decay in the split beam mode because of the higher laser irradiance. The temporal evolutions of signal enhancement factors indicate that the enhancement effect first rises and then drops with delay time and the maximum enhancement factor of Al plasma comes later than that of Cu plasma under the same laser energy. The mechanisms behind it are discussed. It is also found that the electron density exhibits a faster decay with delay time in the split beam mode, mainly due to the faster plasma expansion. And a slower increase of electron density with laser energy is observed in the split beam mode because of the plasma shielding effect.
机译：单梁分裂方法用于增强非平面样本表面的激光束放射极端条件下的Libs的信号强度。时间分辨光谱表明，由于激光辐照度较高，激光烧蚀等离子体呈现出较强的光谱强度和较慢的等离子体衰减。信号增强因子的时间演变表明增强效果首先上升，然后用延迟时间下降，并且Al等离子体的最大增强因子在同一激光能量下的up血浆之后。讨论了它背后的机制。还发现电子密度在分流光束模式下具有延迟时间的速度更快，主要是由于速度较快的膨胀。由于等离子体屏蔽效果，在分流梁模式下观察到具有激光能量的电子密度的较慢增加。

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