预烧蚀激光参数对双脉冲激光诱导击穿光谱增强的影响  

Pre-Ablation Laser Parameters Effect on the Spectral Enhancement of Double Pulsed Laser Induced Breakdown Spectroscopy

作　　者：高勋[1,2] 邵妍[1] 杜闯[1] 赵振明[1] 郑权 林景全[1] 

机构地区：[1]长春理工大学理学院,吉林长春130022 [2]长春长春新产业光电技术有限公司,吉林长春130103

出　　处：《中国激光》2013年第8期243-247,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金(11074027;60978014;61178022;11211120156);吉林省科技厅项目(20100168;20111812;201215132);教育部博士点基金-新教师(20112216120006)

摘　　要：以合金钢为样品,利用Cr I 520.8nm和Fe I 522.7nm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。Cr I 520.8nm谱线在30ms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。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.

关 键 词：光谱学 等离子体 双脉冲激光诱导击穿光谱 正交预烧蚀 光谱增强 

分 类 号：O433.4[机械工程—光学工程]