高亮度同步辐射源聚焦X射线光束的相干特性
Coherence properties of focused X-ray beams at high brilliance synchrotron sources
摘要：
提出了一种描述部分相干X射线聚焦光束特性的解析方法。该方法是基于统计光学的结果，并给出了光束的大小和横向相干长度在任何距离后的光学元件。特别是，在这里我们考虑高斯谢尔模型光束和薄的光学元件。讨论了聚焦元件的非相干和完全相干照明的极限情况。光束定义孔径的效果，通常用于在同步辐射源，以提高横向相干性的聚焦元件相结合，也进行了详细分析。以PETRA Ⅲ同步辐射光源为例，分析了复合折射透镜焦区的相干特性。
英文摘要：
An analytical approach describing properties of focused partially coherent X-ray beams is presented. The method is based on the results of statistical optics and gives both the beam size and transverse coherence length at any distance behind an optical element. In particular, here we consider Gaussian Schell-model beams and thin optical elements. Limiting cases of incoherent and fully coherent illumination of the focusing element are discussed. The effect of the beam defining aperture, typically used in combination with focusing elements at synchrotron sources to improve transverse coherence, is also analyzed in detail. As an example the coherence properties in the focal region of compound refractive lenses at the PETRA III synchrotron source are analyzed.
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