摘要
本文报导波长为1.06μm脉宽(FWHM)约4ns的强脉冲激光辐照下,侣靶发生层裂的实验结果。当入射功率密度在2.0×10^(11)～5×10^(11)W/cm^2范围的激光束作用下,厚度为0.1mm、0.2mm的靶在超临界条件下发生层裂,层裂厚度分别在17±6μm及38±5μm范围。文中使用一种简化模型对阈值条件下不同厚度的靶发生层裂时的层裂片厚度作了近似估算,并与已有实验结果较好地符合。
The experiments on spallation of aluminum targets irradiated by the Nd: glass laser beam with 4ns FWHM and flux of (2-5)×1011W/cm2 are reported in this paper. The spall oc-cured under the supercritical condition ,and the spall thicknesses of 0. 1mm and 0. 2mm thick aluminum targets are 17±6μm and 38 ±5μm respectively. The threshold spall thickness as a function of target thickness has been estimated for the laser induced shock loading with the strain rate over 107s-1 ,and the spall strength of aluminum can reach up to 5-6GPa at such ultrahigh strain rate.
出处
《高压物理学报》
CAS
CSCD
北大核心
1993年第1期61-65,共5页
Chinese Journal of High Pressure Physics
基金
国家自然科学基金
国家高技术强激光领域资助项目
关键词
应力波
层裂
激光辐照
铝
interaction of laser with materials,dynamic fracture,laser induced shock wave.
