title: X-ray wavefront characterization of a Fresnel zone plate using a two-dimensional grating interferometer.
abstract: The x-ray wavefront downstream of a Fresnel zone plate (FZP) was characterized using a two-dimensional grating interferometer. Transverse wavefront slope maps, measured using a raster phase-stepping scan, allowed accurate phase reconstruction of the x-ray beam. Wavefront measurements revealed that the wavefront error is very sensitive to the input beam entering the FZP. A small stack of one-dimensional compound refractive lenses was used to introduce astigmatism in the probing x-ray beam to investigate the contribution of the incoming beam in contrast to the optical aberrations. Experimental data were shown to be consistent with theoretical calculations.
authors.affiliation: Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, UK. Hongchang.wang@diamond.ac.uk
authors.forename: Hongchang
authors.initials: H
authors.lastname: Wang
authors.forename: Sebastien
authors.initials: S
authors.lastname: Berujon
authors.forename: Ian
authors.initials: I
authors.lastname: Pape
authors.forename: Simon
authors.initials: S
authors.lastname: Rutishauser
authors.forename: Christian
authors.initials: C
authors.lastname: David
authors.forename: Kawal
authors.initials: K
authors.lastname: Sawhney