Shearing Interferometer for Quantifying the Coherence of Hard X-Ray Beams

F. Pfeiffer, O. Bunk, C. Schulze-Briese, A. Diaz, T. Weitkamp, C. David, J. F. van der Veen, I. Vartanyants, and I. K. Robinson
Phys. Rev. Lett. 94, 164801 – Published 26 April 2005

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   μm. 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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  • Received 26 January 2005

DOI:https://doi.org/10.1103/PhysRevLett.94.164801

©2005 American Physical Society

Authors & Affiliations

F. Pfeiffer, O. Bunk, C. Schulze-Briese, A. Diaz, T. Weitkamp, C. David, and J. F. van der Veen

  • Paul Scherrer Institut, CH-5232 Villigen, Switzerland

I. Vartanyants

  • HASYLAB, DESY, Notkestrasse 85, D-22607 Hamburg, Germany

I. K. Robinson

  • Department of Physics, University of Illinois, Urbana, Illinois 61801, USA

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Issue

Vol. 94, Iss. 16 — 29 April 2005

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