Abstract
Gabor-type holographic imaging in the hard X-ray region is carried out using a speckle-free coherent spherical wave that is generated by combined use of an X-ray focusing optic and a spatial filter at the focal point. A Fresnel zone plate with an outermost zone width of 100 nm is used as the X-ray focusing device, and a nickel pinhole of 1 µm diameter is used as the spatial filter. Using the coherent X-ray beam at the beamline 20XU of SPring-8, sub-optical spatial resolution is achieved at an X-ray energy of 8.5 keV.
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