| Abstract Scope |
We report on two new x-ray coherent imaging methods, that combine high spatial resolution with the ability to map volumes deep within polycrystalline specimens. In both an x-ray objective is introduced between the sample and the detector. Iterative oversampling routines and Fourier synthesis are used to reconstruct the shape and strain field from the far field intensity pattern. The first method, mimicking Bragg CDI, is shown experimentally to be reconstruct small but embedded grains in 3D without compromising the spatial resolution. In the second method, confocal Bragg ptychography, a local volume is defined by the dimensions of an incident pencil beam and the objective. Numerical simulations show a resolution of order 20 nm. The lens characteristics are shown to be not critical. The status and limitations of the methods will be outlined. This work is a collaboration between DTU, ESRF, Aix Marseille and MAX IV. |