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Updated: Oct 2, 2025

Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
Published on: June 19, 2018
Fourier ptychographic dark field x-ray microscopy
A new coherent Fourier ptychographic method enhances dark-field x-ray microscopy (DFXM) for detailed 3D lattice strain mapping in crystalline materials. This technique improves structural distortion analysis with minimal instrumentation changes.
Area of Science:
- Materials Science
- Crystallography
- X-ray Optics
Background:
- Dark-field x-ray microscopy (DFXM) maps 3D lattice strain and rotation in crystalline materials.
- Current DFXM analysis uses an incoherent framework, limiting detailed structural distortion mapping.
Purpose of the Study:
- To introduce a coherent, Fourier ptychographic approach for DFXM.
- To enable quantitative phase reconstruction and aberration mapping with minimal changes to existing DFXM instruments.
Main Methods:
- Implementation of a coherent Fourier ptychographic analysis on DFXM data.
- Experimental demonstration on thin film crystalline samples.
Main Results:
- Achieved quantitative phase reconstructions of thin film samples.
- Successfully mapped aberrations in the objective lens.
- Demonstrated potential for characterizing materials with weak structural contrast.
Conclusions:
- The coherent Fourier ptychographic method offers an advancement for DFXM.
- This approach enhances the characterization of local structural distortions in crystalline materials.
- The technique is compatible with existing DFXM instrumentation and acquisition strategies.
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