强激光与粒子束, 2015, 27 (3): 032039, 网络出版: 2015-03-23
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
激光与物质相互作用 重复频率 刃边焦斑测定法 空间分辨 laser interaction with matter repetition frequency knife-edge method spatial resolution
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0.2 μm, 双网格分别为400目铜网格和394 lp/cm的镍网, 利用X射线CCD作为探测元件。Ti宝石激光在能量1 J、脉宽40 fs、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25 TW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43 μm, 而网格空间分辨力为34 μm。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。
Abstract
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 (1 J/40 fs/10 Hz) with an intensity of approximately 4.4×1018 W/cm2 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 43 μm, and the estimated spatial resolution was 34 μm. 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.
王洪建, 阳庆国, 叶雁, 李军, 孟立民, 余勇, 王海容, 母健, 彭其先, 李泽仁. 重复频率下飞秒激光驱动产生的X射线焦斑测量[J]. 强激光与粒子束, 2015, 27(3): 032039. Wang Hongjian, Yang Qingguo, Ye Yan, Li Jun, Meng Limin, Yu Yong, Wang Hairong, Mu Jian, Peng Qixian, Li Zeren. Measurement of femtosecond laser-driven X-ray focal spot with repetition frequency[J]. High Power Laser and Particle Beams, 2015, 27(3): 032039.
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