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K-alpha x-ray source using high energy and high repetition rate laser system for phase contrast imaging

机译：使用高能量和高重复率激光系统的K-alpha X射线源进行相衬成像

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摘要

K-alpha x-ray sources from laser produced plasmas provide completely new possibilities for x-ray phase-contrast imaging applications. By tightly focusing intense femtosecond laser pulses onto a solid target, K-alpha x-ray pulses are generated through the interaction of energetic electrons created in the plasma with the bulk target. In this paper, we present a continuous and efficient Mo K-alpha x-ray source produced by a femtosecond laser system operating at 100 Hz repetition rate with maximum pulse energy of 110 mJ before compression. The source has x-ray conversion efficiency greater than 10~(-5) into K-alpha line emission. In preparation for phase contrast imaging applications, the size of the resultant K-alpha x-ray emission spot has been also characterized. The source exhibits sufficient spatial coherence to observe phase contrast. We observe a relatively small broadening of the K-alpha source size compared to the size of the laser beam itself. Detailed characterization of the source including the x-ray spectrum and the x-ray average yield along with phase contrast images of test objects will be presented.
机译：来自激光等离子体的K-alpha X射线源为x射线相衬成像应用提供了全新的可能性。通过将强大的飞秒激光脉冲紧密聚焦在固体目标上，通过在等离子体中产生的高能电子与整体目标的相互作用产生了K-alpha x射线脉冲。在本文中，我们介绍了由飞秒激光系统产生的连续有效的MoK-αx射线源，该系统以100 Hz的重复频率工作，压缩前的最大脉冲能量为110 mJ。该源到K-alpha线发射的x射线转换效率大于10〜（-5）。在准备相衬成像应用时，还对了所得的K-alpha x射线发射点的大小进行了表征。光源显示出足够的空间相干性以观察相衬。与激光束本身的尺寸相比，我们观察到K-alpha光源尺寸的扩展相对较小。将介绍光源的详细特性，包括X射线光谱和X射线平均产率以及测试对象的相衬图像。

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