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Related Experiment Video

Updated: Dec 14, 2025

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Ptychographic X-ray speckle tracking.

Andrew J Morgan1,2, Harry M Quiney1, Saša Bajt3,4

  • 1ARC Centre of Excellence in Advanced Molecular Imaging, School of Physics, University of Melbourne, Parkville, Victoria 3010, Australia.

Journal of Applied Crystallography
|July 21, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a novel wavefront metrology technique using X-ray speckle tracking. The method enables precise measurement of phase gradients for highly divergent wavefields, advancing nanoscale imaging capabilities.

Keywords:
X-ray speckle trackingin-line projection holographyphase retrievalptychographywavefront metrology

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Area of Science:

  • Optics and Photonics
  • X-ray Imaging
  • Wavefront Metrology

Background:

  • Accurate wavefront measurement is crucial for advanced imaging.
  • Existing methods struggle with highly divergent wavefields and low-coherence sources.
  • Ptychography-based methods require undistorted reference images.

Purpose of the Study:

  • To develop a robust method for measuring the phase gradient of wavefronts.
  • To enable high-resolution imaging of highly divergent wavefields.
  • To overcome limitations of existing wavefront metrology techniques.

Main Methods:

  • Speckle tracking in projection holograms by monitoring relative speckle motion.
  • Scanning a sample across the wavefront without needing a reference image.
  • Utilizing a modified speckle tracking approximation based on Fresnel integral expansion.

Main Results:

  • Achieved nanoradian angular sensitivity and nanoscale sample projection imaging.
  • Demonstrated robustness to low-coherence X-ray sources and laboratory-based setups.
  • Showed suitability for X-ray free-electron laser facilities despite beam-pointing fluctuations.

Conclusions:

  • The presented method offers a significant advancement in wavefront metrology.
  • It is particularly well-suited for characterizing highly divergent wavefields and for applications requiring high angular sensitivity.
  • The technique's robustness and adaptability make it valuable for diverse X-ray imaging applications.