Journal
OPTICS EXPRESS
Volume 19, Issue 13, Pages 12066-12073Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.012066
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For coherent X-ray imaging of pure phase objects we study the reliability of linear relations in phase-retrieval algorithms based on a single intensity map after free-space propagation. For large phase changes and/or large propagation distances we propose two venues of working beyond linearity: Projection onto an effective, linear and local model in Fourier space and expansion of intensity contrast in powers of object-detector distance. We apply both algorithms successfully to simulated data. (C) 2011 Optical Society of America
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