Study on the influence of side-blown airflow velocities on plasma and combustion wave generated from fused silica induced by combined pulse laser  

作　　者：余昊 蔡继兴 毛洪涛 王云鹏 李忆 李顺 Hao YU;Jixing CAI;Hongtao MAO;Yunpeng WANG;Yi LI;Shun LI(Jilin Key Laboratory of Solid-State Laser Technology and Application,School of Physics,Changchun University of Science and Technology,Changchun 130022,People’s Republic of China;Chongqing Research Institute,Changchun University of Science and Technology,Chongqing 401135,People’s Republic of China)

机构地区：[1]Jilin Key Laboratory of Solid-State Laser Technology and Application,School of Physics,Changchun University of Science and Technology,Changchun 130022,People’s Republic of China [2]Chongqing Research Institute,Changchun University of Science and Technology,Chongqing 401135,People’s Republic of China

出　　处：《Plasma Science and Technology》2024年第7期165-176,共12页等离子体科学和技术（英文版）

基　　金：funded by the International Science and Technology Cooperation Project of Jilin Provincial Department of Science and Technology(No.20230402078GH)。

摘　　要：This study examines the impact of variations in side-blowing airflow velocity on plasma generation,combustion wave propagation mechanisms,and surface damage in fused silica induced by a combined millisecond-nanosecond pulsed laser.The airflow rate and pulse delay are the main experimental variables.The evolution of plasma motion was recorded using ultrafast time-resolved optical shadowing.The experimental results demonstrate that the expansion velocities of the plasma and combustion wave are influenced differently by the sideblowing airflow at different airflow rates(0.2 Ma,0.4 Ma,and 0.6 Ma).As the flow rate of the sideblow air stream increases,the initial expansion velocities of the plasma and combustion wave gradually decrease,and the side-blow air stream increasingly suppresses the plasma.It is important to note that the target vapor is always formed and ionized into plasma during the combined pulse laser action.Therefore,the side-blown airflow alone cannot completely clear the plasma.Depending on the delay conditions,the pressure of the side-blowing airflow,the influence of inverse Bremsstrahlung radiation absorption and target surface absorption mechanisms can lead to a phenomenon known as the double combustion waves when using a nanosecond pulse laser.Both simulation and experimental results are consistent,indicating the potential for further exploration of fused silica targets in the laser field.

关 键 词：different airflow speeds PLASMA combustion wave different pulse delay surface damage 

分 类 号：TN2[电子电信—物理电子学]