用光学记录速度干涉仪测量自由面速度  

Free-surface velocity measurements using an optically recording velocity interferometer

作　　者：路建新[1] 王钊[1] 梁晶[1] 单玉生[1] 周创志[1] 向益淮[1] 陆泽[1] 汤秀章[1] 

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《强激光与粒子束》2006年第5期799-802,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金资助课题(10299046);国家863计划项目资助课题

摘　　要：建立了一套光学记录速度干涉仪系统(ORVIS),用于测量强激光产生的冲击波状态方程中的自由面速度。该光学记录速度干涉仪系统的时间分辨率为179 ps,可以测量自由面速度随时间变化的整个过程。在天光KrF高功率准分子激光装置上进行激光打靶实验,激光波长248.4 nm,脉冲宽度25 ns,最大输出能量158 J。在激光功率密度为6.24×1011W.cm-2的条件下,测得厚20μm铁膜的自由面速度可达3.86 km/s;在激光功率密度为7.28×1011W.cm-2条件下,100μm铝膜(靶前有100μm的CH膜作为烧蚀层)的自由面速度可以达到2.87 km/s。An optically recording velocity interferometer system（ORVIS） was developed for the free-surface velocity measurements in the equation of state experiments. The time history of free-surface velocity could be recorded by the electronic streak camera. In the experiments, ORVIS got a 179 ps time resolution, and a higher time resolution could be got by minimizing the de- lay time. The equation of state experiments were carried out on the high power excimer laser system called ＂Heaven Ⅰ ＂ with laser wavelength of 248.4 nm, pulse duation of 25 ns and maximum energy 158 J. Free-surface velocity of 20μm thick iron got 3.86 km/s with laser intensity of 6.24×10^11W·cm^-2 , and free-surface velocity of 100μm thick aluminum with 100 μm CH foil at the front got 2.87 km/s with laser intersity 7.28×10^11W·cm^-2.

关 键 词：光学记录速度干涉仪 状态方程 自由面速度 条纹相机 冲击波 

分 类 号：O536[理学—等离子体物理]