A K-alpha x-ray source using high energy and high repetition rate laser system for phase contrast imaging.
A K-alpha x-ray source using high energy and high repetition rate laser system for phase contrast imaging.
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K-alpha X 射线源使用高能量和高重复率激光系统进行相衬成像。
DOI：
10.1117/12.826646
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Krol,Andrzej
中科院分区：
文献类型：
--
作者：
Serbanescu,Cristina;Fourmaux,Sylvain;Kieffer,Jean-Claude;Kincaid,Russell;Krol,Andrzej
激光等离子体产生的k - α x射线源为x射线相衬成像应用提供了全新的可能性。通过将强烈的飞秒激光脉冲紧密聚焦到固体目标上，通过等离子体中产生的高能电子与大块目标的相互作用产生k - α x射线脉冲。在本文中，我们提出了一个连续和高效的Mo k - α x射线源，由飞秒激光系统在100 Hz重复频率下产生，压缩前最大脉冲能量为110 mJ。该光源对k - α线发射的x射线转换效率大于10−5。在相衬成像应用的准备中，所得到的k - α x射线发射点的大小也被表征。光源表现出足够的空间相干性来观察相衬。我们观察到与激光束本身的尺寸相比，k - α源尺寸的展宽相对较小。详细描述了光源的特征，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。
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 an x-ray conversion efficiency of 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.