Convergent-beam diffraction of ultra-short hard X-ray pulses focused by a capillary lens
Convergent-beam diffraction of ultra-short hard X-ray pulses focused by a capillary lens
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毛细管透镜聚焦的超短硬 X 射线脉冲的会聚光束衍射
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
A. Bjeoumikhov
中科院分区：
文献类型：
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作者：
R. Tommasini;R. Bruch;E. Fill;A. Bjeoumikhov
我们报道了用x射线毛细管透镜将fs激光等离子体聚焦到小于100 μm光斑的x射线脉冲产生的衍射图样。用200 mJ/130 fs的钛蓝宝石激光脉冲以10 Hz的频率照射运动的铁带。[Fe]Kα (λ=0.194 nm)辐射从胶带背面发出，被毛细管透镜聚焦到一个点上，强度增强约1600。该系统的能力，有效地允许从微米尺寸的样品衍射证明了从Si（111）晶体产生良好的照明衍射图，仅在10秒左右获得良好的信噪比。不同的传播路径长度在透镜中引起x射线脉冲的角编码延迟，从而为实现新型超快条纹相机提供了可能。
We report the generation of diffraction patterns using X-ray pulses from a fs-laser plasma focused by an X-ray capillary lens to a spot size smaller than 100 μm. A thin moving iron tape is irradiated at 10 Hz with 200 mJ/130 fs titanium–sapphire laser pulses. [Fe]Kα (λ=0.194 nm) radiation emitted from the rear side of the tape is focused to a spot by the capillary lens resulting in an intensity enhancement of about 1600. The ability of this system to effectively allow diffraction from samples of micron size is demonstrated by producing well-illuminated diffractograms from a Si(111) crystal with good signal to noise ratio obtained in only about 10 s. The different path lengths of propagation in the lens induce an angle-encoded delay of the converging X-ray pulse and thus provide the possibility of realizing a novel ultra-fast streak camera.