软X射线自由电子激光中Hanbury Brown和Twiss干涉的理论分析
Theoretical Analysis of Hanbury Brown and Twiss Interferometry at Soft X-ray Free-Electron Lasers
摘要：
在这项工作中，我们提供了在软X射线自由电子激光（XFELs）的实验中进行的二阶关联函数的分析的理论背景。通常，XFEL处的软X射线光束线由可变线间距（VLS）单色器装备。我们进行检查的光束传输通过这样的VLS单色器特别考虑到有限的单色器分辨率和出口狭缝宽度之间的相互作用。然后，我们提供了一般的分析，在光谱和空间域的二阶相关强度。最后，我们将这些函数与高斯谢尔模型脉冲极限下入射到单色器单元的光束的统计特性联系起来。
英文摘要：
In this work we provide theoretical background for the analysis of second-order correlation functions in experiments performed at the soft x-ray free-electron lasers (XFELs). Typically, soft x-ray beamlines at XFELs are equipped by the variable line spacing (VLS) monochromators. We perform examination of the beam propagation through such VLS monochromator taking specially into account the interplay between the finite monochromator resolution and the exit slits width. We then provide general analysis of the second-order correlation intensities in spectral and spatial domains. Finally, we connect these functions with the statistical properties of the beam incoming to the monochromator unit in the limit of Gaussian Schell-model pulses.
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