Nanosecond laser preheating effect on ablation morphology and plasma emission in collinear dual-pulse laser-induced breakdown spectroscopy  

作　　者：Na LI Edward HAREFA Weidong ZHOU 李娜;Edward HAREFA;周卫东(Key Laboratory of Optical Information Detection and Display Technology of Zhejiang,Zhejiang Normal University,Jinhua 321004,People’s Republic of China)

机构地区：[1]Key Laboratory of Optical Information Detection and Display Technology of Zhejiang,Zhejiang Normal University,Jinhua 321004,People’s Republic of China

出　　处：《Plasma Science and Technology》2022年第11期145-150,共6页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(No.61975186).

摘　　要：Focus-offset collinear dual-pulse laser-induced breakdown spectroscopy is designed and used to investigate the laser ablation and spectral intensity with an aluminum alloy sample.The laser crater morphologies and ablation volumes were measured.An inter-pulse time delay dependent ablation efficiency on a nanosecond laser-heated sample was observed,which was similar to the trend of spectral intensity versus inter-pulse time delay in the delay time less than 3μs.Based on the observation,the nanosecond pulse laser preheating effect on subsequent second laser ablation and signal enhancement is discussed,which will be helpful for understanding the ablation and signal enhancement mechanism in the standard collinear DP-LIBS technique.

关 键 词：enhancement mechanism laser ablation crater morphology target preheating 

分 类 号：TN24[电子电信—物理电子学] O53[理学—等离子体物理]