摘要
采用自行研制的力学传感器测量了在不同激光能量下水下激光打靶的力学效应 .实验结果表明 ,在脉冲激光作用下 ,水中靶材依次受到激光烧蚀压力和激光空泡在固体壁面附近溃灭时产生的射流冲击力的作用 ,且两作用力均随入射能量的增大而单调增加 .根据实验测得的烧蚀压力、入射激光功率密度与烧蚀压强的关系 ,得到了空泡射流对固壁面的瞬态冲击力数值 .同时由实验结果还可得到在不同激光能量下空泡溃灭的周期、最大泡半径、空泡溃灭时所产生的射流速度及空泡能量等表征空泡特征的重要物理量 .有关实验结果可为相关研究提供参考 .
The mechanical effects of laser-metal interaction underwater at different incident laser energies are investigated in detail using a new force sensor based on optical beam deflection.The experimental results show that underwater targets are impacted in turn by laser-generated ablation force and high-speed liquid-jet impulse induced by bubble collapes.Furthermore,the amplitudes of the three forces are increased with the increase of laser energy.According to the ablation force detected in experiment and the relationship between laser intensity and ablation pressure,the value of liquid-jet impact can be easily obtained.In addition,the bubble collapsing duration,the maximum bubble radius,the liquid-jet velocity and bubble energy at different laser energies can also be attained by the experimental results,which are valuable in the relevant research fields.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第5期1413-1418,共6页
Acta Physica Sinica
基金
国家自然科学基金(批准号:60208004)
江苏省自然科学基金(批准号:BK2001056)
教育部高校优秀青年教师奖励计划
激光技术国家重点实验室开放基金(批准号:2005)资助的课题.~~
