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Generation of Virtual Point Source by Diffraction from Screen Edge as an X-ray Source for High-resolution Holography

X-ray holography [1] is one of the promising methods for high-resolution phase-contrast imaging. The spatial resolution of traditional holography, Gabor holography with spherical wave and Fourier transform holography with point reference source, is essentially determined by the source size of spherical wave. The small x-ray reference sources are now usually made with modern x-ray focusing optics such as Fresnel zone plates [2, 3]. An idea for making small virtual x-ray source is utilization of external total reflection of very short convex cylindrical mirrors, and the method is already applied to Gabor holography in the hard x-ray region [4]. A crossed waveguide optics [5] is also applied to hard x-ray beam confinement and holographic imaging. Here, we propose a method for generation of small virtual point source by combining two screen-edges, and its application to Gabor type holography is also described.