激光水下打靶力学效应的测试与分析

采用自行研制的光纤力学传感器研究了在不同能量的脉冲激光作用下，水中靶材的力学效应。实验和理论分析研究结果表明，水中靶材依次受到激光烧蚀压力及空泡溃灭产生两次射流冲击力的作用，冲击力幅值随作用激光能量的增加均先上升后下降；而射流产生时刻及空泡溃灭时刻随激光能量增加呈单调递增趋势；且射流产生的时刻早于空泡溃灭的时刻。

Mechanical Effects During Pulsed Laser and Metals Interaction in Water

A novel force sensor based on optical beam deflection was developed to investigate the mechanical effects during the pulsed laser ablation of a metal in water at different pulsed energies from 2.4 mJ to 27.6 mJ.The detection principles of this sensor were discussed in detail.The experimental and theoretical results are shown that the target underwater is affected by a laser ablation force,two liquid-jet impacts induced by a cavitation bubble collapse near a solid boundary;with the laser incident energy increase,the amplitudes of three forces all firstly increase and then decrease during the interaction process.The liquid-jet formation and the final bubble collapse become earlier with the energy increase.Besides,the former appear earlier than the latter.The results are of value in theoretical and applied research in the laser-matter interaction water.