Ni原子双飞秒脉冲激光诱导击穿光谱的信号增强研究  

Investigation on the signal enhancement of the double femtosecond pulse laser-induced breakdown spectroscopy of nickel

作　　者：伏再喜[1] 张先燚[1] 李庆[1] 吕良宏[1] 郑贤峰[1] 季学韩[1] 崔执凤[1] 

机构地区：[1]安徽师范大学原子与分子物理研究所,芜湖241000

出　　处：《原子与分子物理学报》2011年第6期1061-1066,共6页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(11074003;20973001);安徽省自然科学基金(090416229)

摘　　要：在大气环境下来用波长为800 nm,脉宽为30 fs的飞秒激光研究了Ni的双脉冲激光诱导击穿光谱,与单飞秒脉冲激光诱导击穿光谱相比,双飞秒脉冲在最优的双脉冲相对延时下,其信号强度增强接近10倍,实验研究了双脉冲相对延时在0～1300 ps范围内不同延时对激光诱导击穿光谱信号强度增强因子的影响.整个相对延时区域可以分为三个阶段:在0～50 ps区域内信号增强因子是一个持续增大的过程,在50 ps左右,达到一个最大值;在50～300 ps区域内,信号增强因子呈现出一个先下降后上升的过程;在300～1300 ps,信号增强因子基本保持不变.Double femtosecond pulse laser-induced breakdown spectroscopy （LIBS） of nickel was investi- gated by using two 30 fs laser radiation, both at 800 nm, in the collinear configuration under ambient conditions. In comparison with the single-pulse （SP） LIBS, the signal enhancement of a nearly 10 fold was achieved with double-pulse （DP） radiations at the optimum inter-pulses delay. The influence of the interpulse delay on the LIBS signal intensity within 0～l300 ps was investigated and three temporal intervals of interaction were observed. From 0 to 50 ps, the intensity of the emission lines increases steadily and a maximum is reached at approximately 50 ps; from 50 to 300 ps, the signal enhancement factor decreases firstly and then increases; from 300 to 1300 ps, the signal enhancement factor remains constant.

关 键 词：激光诱导击穿光谱 飞秒脉冲激光 双脉冲 信号增强因子 NI 

分 类 号：O561[理学—原子与分子物理]