Source focusing and coherent imaging of a microscopic object at weak spatial coherence of the synchrotron radiation beam

Experimental results are presented on the measurement of a holographic (phase-contrast) image of a boric fiber (100-μm-diameter boric cylinder with a 20-μm-diameter tungsten core) and on radiation focusing by Fresnel zone plates using the Kurchatov synchrotron radiation source. By comparison of the obtained hologram with theoretically calculated data, the vertical size of the source was determined to be 325 ± 25 μm. This value was also confirmed by measuring the half-width of the direct image of the source. Features of image recording on a photographic film are discussed.