Pfeiffer F, Bunk O, Schulze-Briese C, Diaz A, Weitkamp T, David C, van der Veen J F, Vartanyants I, Robinson I K
Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland.
Phys Rev Lett. 2005 Apr 29;94(16):164801. doi: 10.1103/PhysRevLett.94.164801. Epub 2005 Apr 26.
We report a quantitative measurement of the full transverse coherence function of the 14.4 keV x-ray radiation produced by an undulator at the Swiss Light Source. An x-ray grating interferometer consisting of a beam splitter phase grating and an analyzer amplitude grating has been used to measure the degree of coherence as a function of the beam separation out to 30 microm. Importantly, the technique provides a model-free and spatially resolved measurement of the complex coherence function and is not restricted to high resolution detectors and small fields of view. The spatial characterization of the wave front has important applications in discovering localized defects in beam line optics.
我们报告了对瑞士光源处一台波荡器产生的14.4 keV X射线辐射的全横向相干函数的定量测量。一种由分束器相位光栅和分析器振幅光栅组成的X射线光栅干涉仪已被用于测量相干度随光束间距变化的情况，测量范围可达30微米。重要的是，该技术提供了一种对复相干函数的无模型且空间分辨的测量，并且不限于高分辨率探测器和小视场。波前的空间表征在发现束线光学中的局部缺陷方面具有重要应用。
