Time-resolved spectroscopy of collinear femtosecond and nanosecond dual-pulse laser-induced Cu plasmas  

作　　者：Qiuyun WANG Hongxia QI Xiangyu ZENG Anmin CHEN Xun GAO Mingxing JIN 王秋云;齐洪霞;曾祥榆;陈安民;高勋;金明星(Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,People's Republic of China;School of Science,Changchun University of Science and Technology,Changchun 130022,People's Republic of China)

机构地区：[1]Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,People's Republic of China [2]School of Science,Changchun University of Science and Technology,Changchun 130022,People's Republic of China

出　　处：《Plasma Science and Technology》2021年第11期121-127,共7页等离子体科学和技术（英文版）

基　　金：support of National Natural Science Foundation of China(Nos.11674128,11674124 and 11974138);the Scientific and Technological Research Project of the Education Department of Jilin Province,China(No.JJKH20200937KJ)。

摘　　要：In this paper,we investigate the time-resolved spectroscopy of collinear femtosecond(fs)and nanosecond(ns)dual-pulse(DP)laser-induced plasmas.A copper target was used as an experimental sample,and the fs laser was considered as the time zero reference point.The interpulse delay between fs and ns laser beams was 3μs.First,we compared the time-resolved peak intensities of Cu(I)lines from Cu plasmas induced by fs+ns and ns+fs DP lasers with collinear configuration.The results showed that compared with the ns+fs DP,the fs+ns DP laser-induced Cu plasmas had stronger peak intensities and longer lifetimes.Second,we calculated time-resolved plasma temperatures using the Boltzmann plot with three spectral lines at Cu(I)510.55,515.32 and 521.82 nm.In addition,time-resolved electron densities were calculated based on Stark broadening with Cu(I)line at 521.82 nm.It was found that compared with ns+fs DP,the plasma temperatures and electron densities of the Cu plasmas induced by fs+ns DP laser were higher.Finally,we observed images of ablation craters under the two experimental conditions and found that the fs+ns DP laser-produced stronger ablation,which corresponded to stronger plasma emission.

关 键 词：laser-induced breakdown spectroscopy fs+ns and ns+fs dual-pulse time-resolved spectroscopy plasma temperature electron density 

分 类 号：O657.38[理学—分析化学]