重复频率下飞秒激光驱动产生的X射线焦斑测量  

Measurement of femtosecond laser-driven X-ray focal spot with repetition frequency

作　　者：王洪建[1,2] 阳庆国[2] 叶雁[2] 李军[2] 孟立民[2] 余勇[2] 王海容[2] 母健[2] 彭其先[2] 李泽仁[2] 

机构地区：[1]重庆工商大学制造装备机构设计与控制重庆市重点实验室,重庆市发展信息管理工程技术研究中心,重庆400067 [2]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《强激光与粒子束》2015年第3期280-284,共5页High Power Laser and Particle Beams

基　　金：国家高技术发展计划项目;强场激光物理国家重点实验室开放项目;重庆市教委科学技术研究项目(KJ120710;KJTD201313);重庆工商大学博士启动基金项目(2011-56-04);重庆工商大学青年基金项目

摘　　要：为了获取强激光驱动产生的X射线光源焦斑尺寸和空间分辨率,设计了刃边及双网格方法,其中刃边厚度为0.2μm,双网格分别为400目铜网格和394lp/cm的镍网,利用X射线CCD作为探测元件。Ti宝石激光在能量1J、脉宽40fs、频率10 Hz、激光功率密度约为4.4×1018 W/cm2的条件下,重复频率加载圆盘Cu靶。在中国工程物理研究院25TW激光装置上首次获得了X射线的焦斑及网格图像,并推算了该装置的X射线焦斑尺寸为43μm,而网格空间分辨力为34μm。结果表明该刃边及双网格方法适合强激光驱动产生的X射线焦斑尺寸测定。In order to obtain focal spot size and spatial resolution of X-ray driven by the ultra-intense laser,a new method was designed to diagnose with a 0.2-μm-thick knife-edge attached two different meshes,one copper mesh of 400 meshes and another nickel of 394 line pairs per centimeter.The X-ray was obtained by X-ray CCD.Tisapphire laser（1J/40fs/10Hz）with an intensity of approximately 4.4×10^18 W/cm^2 shot the disc Cu target by repetition frequency.The experiment was carried out successfully on a 25 TW laser device at CAEP,in which the first focal spot and the X-ray image of the meshes were both obtained.The estimated focal spot of the X-ray was 43μm,and the estimated spatial resolution was 34μm.The results showed that the method of knife-edge and two meshes was suitable for the measurement of focal spot size of X-ray driven by ultra-intense laser.

关 键 词：激光与物质相互作用 重复频率 刃边焦斑测定法 空间分辨 

分 类 号：TH744.15[机械工程—光学工程] O572.24[机械工程—仪器科学与技术]