Berlin 2018 – scientific programme
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 10: Spectroscopy and Microscopy I with X-rays and Ions
KFM 10.5: Talk
Tuesday, March 13, 2018, 11:00–11:20, EMH 225
Divide and Update: Towards Single-Shot Object and Probe Retrieval for Near-Field Holography — •Johannes Hagemann1,2 and Tim Saltditt1 — 1Institut für Röntgenphysik, Friedrich-Hund-Platz 1, 37077 Göttingen — 2current address: DESY, X-Ray Nanoscience and X-Ray, Optics, Notkestraße 85, 22607 Hamburg
We present a phase reconstruction scheme for X-ray near-field holographic imaging based on a separability constraint for probe and object. In order to achieve this, we have devised an algorithm which requires only two measurements -- with and without an object in the beam. This scheme is advantageous if the standard flat-field correction fails and a full ptychographic dataset can not be acquired, since either object or probe are dynamic. The scheme is validated by numerical simulations and by a proof-of-concept experiment using highly focused undulator radiation of the beamline ID16a of the European Synchrotron Radiation Facility (ESRF).