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Updated: Aug 10, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
Published on: October 11, 2016
Analysis of illumination coherence properties in small-source systems such as synchrotrons
Chang Chang1, Patrick Naulleau, David Attwood
1Center for X-ray Optics, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. cnchang@lbl.gov
Modern synchrotron beamlines require a rigorous analysis of coherence, as standard approximations fail. This study reveals how beamline aberrations impact coherence properties, offering insights for improved experimental setups.
Area of Science:
- Optics and Photonics
- Synchrotron Radiation Science
Background:
- Synchrotron beamlines frequently utilize critical illumination systems for imaging.
- The Zernike approximation for object-image coherence is often insufficient for synchrotron sources due to unique constraints.
Purpose of the Study:
- To perform a rigorous analysis of the object-image coherence relationship specific to synchrotron beamlines.
- To investigate the influence of beamline aberrations on coherence properties.
Main Methods:
- Development of a rigorous theoretical framework for object-image coherence.
- Analysis of coherence properties under synchrotron beamline conditions.
- Explicit study of low-order aberration effects on coherence.
Main Results:
- Beamline aberrations significantly affect the coherence properties of the light at the experimental plane.
- The study quantifies the impact of various low-order aberrations on coherence.
Conclusions:
- A rigorous approach is necessary for accurate coherence calculations in synchrotron beamlines.
- Understanding aberration effects is crucial for optimizing experimental conditions and data interpretation in synchrotron radiation science.
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