Abstract
In this paper, the effects of 1064nm pre-ablation laser parameters on the spectral enhancement of 1064nm/1064nm orthogonal dual-pulse laser induced breakdown spectroscopy (DP-LIBS) were systematically analyzed with the spectral intensity of Cr I 520.84nm and Fe I 522.72nm for the alloy steel. The experimental results showed that DP-LIBS had a maximum spectral enhancement at the experimental conditions of the pre-ablation pulse energy 100mJ, the main ablative pulse energy 100mJ, the pre-ablation pulse focus above the sample surface 1mm and overshoot the main ablative pulse light path 1mm, respectively. The spectral enhancement factor of Cr I 520.84nm varying with inter-pulse delay time showed two peaks, the first was 42.8 at 6μs and the second 48.7 at 15μs, respectively, then decreased rapidly with inter-pulse delay time increasing. Finally, the spectral enhancement mechanisms of orthogonal pre-ablation DP-LIBS were analyzed.
Published Version
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