Open AccessThe influence of strain on image reconstruction in Bragg coherent X‐ray diffraction imaging and ptychography
Author(s) -
Kim Chan,
Scholz Markus,
Madsen Anders
Publication year - 2021
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s160057752100477x
Subject(s) - coherent diffraction imaging , ptychography , optics , phase retrieval , diffraction , x ray , materials science , phase (matter) , bragg's law , superlattice , x ray crystallography , reflection (computer programming) , physics , computer science , optoelectronics , fourier transform , programming language , quantum mechanics
A quantitative analysis of the effect of strain on phase retrieval in Bragg coherent X‐ray diffraction imaging is reported. It is shown in reconstruction simulations that the phase maps of objects with strong step‐like phase changes are more precisely retrieved than the corresponding modulus values. The simulations suggest that the reconstruction precision for both phase and modulus can be improved by employing a modulus homogenization (MH) constraint. This approach was tested on experimental data from a highly strained Fe–Al crystal which also features antiphase domain boundaries yielding characteristic π phase shifts of the (001) superlattice reflection. The impact of MH is significant and this study outlines a successful method towards imaging of strong phase objects using the next generation of coherent X‐ray sources, including X‐ray free‐electron lasers.