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. 2005 Apr 29;94(16):164801.
doi: 10.1103/PhysRevLett.94.164801. Epub 2005 Apr 26.

Shearing interferometer for quantifying the coherence of hard x-ray beams

F Pfeiffer  1 , O Bunk, C Schulze-Briese, A Diaz, T Weitkamp, C David, J F van der Veen, I Vartanyants, I K Robinson
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Free article

Shearing interferometer for quantifying the coherence of hard x-ray beams

F Pfeiffer et al. Phys Rev Lett. .
Free article

Abstract

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.

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