Improving the resolution obtained in lensless imaging with spatially shaped high-order harmonics

摘要

The resolution obtained with coherent diffractive imaging (CDI) is limited by a number of factors, one of which is the transverse coherence of the illuminating beam. For a successful reconstruction, it is accepted that the illuminating beam should have a lateral coherence length of at least twice the largest linear dimension of the sample [1].We used a standard CDI reconstruction code to find the resolution for varying values of ξ. ξ is taken to be the ratio of the widths of the complex coherence factor (CCF) to the spot size of the (Gaussian) illuminating x-ray beam. The resolution was taken to be the distance for the intensity of a reconstructed edge to increase from 10% to 90% of its peak value.