Machine learning for interpreting coherent X-ray speckle patterns

1 code implementation • 15 Nov 2022 • Mingren Shen, Dina Sheyfer, Troy David Loeffler, Subramanian K. R. S. Sankaranarayanan, G. Brian Stephenson, Maria K. Y. Chan, Dane Morgan

Speckle patterns produced by coherent X-ray have a close relationship with the internal structure of materials but quantitative inversion of the relationship to determine structure from images is challenging.

Digital autofocusing of a coded-aperture Laue diffraction microscope

no code implementations • 15 Aug 2022 • Doga Gursoy, Dina Sheyfer, Michael Wojcik, Wenjun Liu, Jonathan Tischler

To provide optimal depth resolution with a coded-aperture Laue diffraction microscope, an accurate position of the coded-aperture and its scanning geometry need to be known.

General approaches for shear-correcting coordinate transformations in Bragg coherent diffraction imaging: Part 1

1 code implementation • 15 Aug 2019 • Siddharth Maddali, Peng Li, Anastasios Pateras, Daniel Timbie, Nazar Delegan, Alex Crook, Hope Lee, Irene Calvo-Almazan, Dina Sheyfer, Wonsuk Cha, F. Joseph Heremans, David D. Awschalom, Virginie Chamard, Marc Allain, Stephan O. Hruszkewycz

Part II builds upon the geometric theory developed in Part I with the formalism to correct the shear distortions directly on an orthogonal grid within the phase retrieval algorithm itself, allowing more physically realistic constraints to be applied.

Instrumentation and Detectors