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Publication Detail
Shearing Interferometer for Quantifying the Coherence of Hard X-Ray Beams
  • Publication Type:
    Journal article
  • Publication Sub Type:
  • Authors:
    Pfeiffer F, Bunk O, Schulze-Briese C, Diaz A, Weitkamp T, David C, vanderVeen JF, Vartanyants I, Robinson IK
  • Publication date:
  • Pagination:
    164801, ?
  • Journal:
    physical review letters
  • Volume:
  • Print ISSN:
  • Keywords:
    Talbot effect, coherence function, synchrotron
  • Notes:
    An important new method of measuring coherence on very small length scales, appropriate for X-rays. The Swiss authors made the measurements at the SLS facility. UCL author Robinson made contributions to the interpretation and presentation of the results.
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 m. 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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