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中文摘要：
以合金钢为样品，利用Cr1520．8nm和Fe1522．7nm谱线强度变化分析预烧蚀激光参数对纳秒532nm／1064nm正交预烧蚀双脉冲激光诱导击穿光谱（DP—LIBS）增强的影响，对实验条件进行了优化。结果表明在预烧蚀脉冲能量为70mJ，主烧蚀脉冲能量为100mJ，预烧蚀脉冲焦点距样品表面1mm，距主烧蚀脉冲光路1mm时，DP—LIBS具有最大光谱增强。CrI520．8nm谱线在30μs时光谱增强达到12．5，然后快速下降。最后初步分析了正交预烧蚀DP—LIBS光谱增强机理。
英文摘要：
Effect of pre-ablation laser parameters on the spectral enhancement of 532 nm/1064 nm orthogonal pre- ablation dual-pulse laser induced breakdown spectroscopy （DP-LIBS） is analyzed by the spectral intensity variation of Cr I 520. 8 nm and Fe I 522. 7 nm for the alloy steel, and the experimental conditions are optimized. The experimental results show that DP-LIBS has a maximum spectral enhancement at the conditions of the pre-ablation pulse energy of 70 mJ, the main ablative pulse energy of 100 mJ, the distance of focus point of the pre-ablation pulse to the sample surface of 1 mm and to the main ablation pulse light path of 1 mm respectively. The spectral enhancement of Cr I 520.8 nm is 12.5 at interpulse delay time 30 t;s, then decreases rapidly. Finally, the spectra enhancement mechanism of orthogonal pre-ablation DP-LIBS is analyzed.
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