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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Diffractive imaging using partially coherent x rays.

L W Whitehead1, G J Williams, H M Quiney

  • 1School of Physics, The University of Melbourne, Victoria 3010, Australia.

Physical Review Letters
|April 7, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces an advanced algorithm for diffractive imaging that accounts for illumination spatial coherence. This method significantly enhances wave field reconstruction quality in X-ray and electron diffraction imaging.

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Area of Science:

  • Diffractive Imaging
  • Coherent Optics
  • X-ray Microscopy

Background:

  • Conventional coherent diffractive imaging (CDI) assumes ideal spatial coherence of the illumination source.
  • Deviations from perfect spatial coherence in the illumination can degrade the quality of reconstructed wave fields.
  • Accurate knowledge of illumination spatial coherence is crucial for high-fidelity diffractive imaging.

Purpose of the Study:

  • To develop and validate an algorithm for diffractive imaging that incorporates measured spatial coherence characteristics of the illumination.
  • To improve the reconstruction of an object's complex transmission function from experimental X-ray diffraction data.
  • To demonstrate the benefits of accounting for partial spatial coherence in wave field reconstructions.

Main Methods:

  • Incorporation of measured spatial coherence properties of the illumination into a novel reconstruction algorithm.
  • Application of the algorithm to reconstruct complex transmission functions using 1.4 keV X-ray diffraction data.
  • Comparison of results with conventional CDI, which represents a limiting case of the developed approach.

Main Results:

  • Significant improvements in the quality of wave field reconstructions were observed, even with small deviations from full spatial coherence.
  • The developed algorithm successfully reconstructs object transmission functions by accounting for illumination coherence.
  • The approach shows enhanced performance over conventional CDI when spatial coherence is not perfect.

Conclusions:

  • Accounting for measured spatial coherence in diffractive imaging algorithms leads to superior wave field reconstructions.
  • The developed formulation is broadly applicable to X-ray and electron diffraction imaging techniques.
  • This work advances the field by providing a more robust method for imaging under realistic illumination conditions.