Monolithic focused reference beam X ray holography

Abstract

Fourier transform holography is a highly efficient and robust imaging method, suitable for single shot imaging at coherent X ray sources. In its common implementation, the image contrast is limited by the reference signal generated by a small pinhole aperture. Increased pinhole diameters improve the signal, whereas the resolution is diminished. Here we report a new concept to decouple the spatial resolution from the image contrast by employing a Fresnel zone plate to provide the reference beam. Superimposed on axis images of distinct foci are separated with a novel algorithm. Our method is insensitive to mechanical drift or vibrations and allows for long integration times common at low flux facilities like high harmonic generation sources. The application of monolithic focused reference beams improves the efficiency of high resolution X ray Fourier transform holography beyond all present approaches and paves the path towards sub 10[thinsp]nm single shot X ray imagin

    Similar works