Measurement of femtosecond laser-driven X-ray focal spot with repetition frequency
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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 m，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4.41018 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 m，而网格空间分辨力为34 m。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-m-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 4.41018 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 m, and the estimated spatial resolution was 34 m. 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.
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