Adaptively coupled phase retrieval in multi-peak Bragg coherent diffraction imaging

Area of Science:

• Materials Science
• Crystallography
• Imaging Techniques

Background:

• Bragg coherent diffraction imaging (BCDI) now routinely measures multiple Bragg peaks per crystal.
• Lattice distortion fields are derived from these peaks, providing strain and rotation data.
• High data rates from new synchrotrons necessitate rapid analysis.

Purpose of the Study:

• To develop and demonstrate a coupled phase retrieval technique for multi-peak BCDI.
• To enable simultaneous analysis of multiple Bragg peaks for 3D crystal imaging.
• To improve data processing efficiency and robustness for high-throughput applications.

Main Methods:

• A novel coupled phase retrieval algorithm was implemented for multi-peak BCDI datasets.
• The technique simultaneously processes all Bragg peaks from a single crystalline grain.
• Redundant information across diffraction patterns was used for signal correction.

Main Results:

• The method produced 3D images of crystal morphology and lattice distortion.
• It effectively detected and suppressed spurious detector signals.
• Adaptive coupling yielded more consistent phase profiles and sharper surfaces than manual editing.

Conclusions:

• The new technique enables robust, high-throughput analysis of multi-peak BCDI data.
• It supports near-real-time strain microscopy at modern synchrotron facilities.
• Reduced manual preprocessing significantly streamlines scientific workflows.