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Instruments / Technical Area	Publication Details	Published
I13-1-Coherence	Refractive hard x-ray vortex phase plates Frank Seiboth , Maik Kahnt , Mikhail Lyubomirskiy , Martin Seyrich , Felix Wittwer , Tobias Ullsperger , Stefan Nolte , Darren Batey , Christoph Rau , Christian G. Schroer Optics Letters 44 DOI: 10.1364/OL.44.004622 Diamond Proposal Number(s): [17460] Show Abstract ▼ Abstract: In this Letter, we report on the creation of hard x-ray beams carrying orbital angular momentum of topological charge −ℏ −ℏ and −3ℏ −3ℏ at a photon energy of 8.2 keV via spiral phase plates made out of fused silica by ultrashort-pulsed laser ablation. The phase plates feature a smooth phase ramp with a 0.5 μm nominal step height and a surface roughness of 0.5 μm. The measured vortex beams show submicrometer-sized donut rings and agree well with numerical modeling. Fused silica phase plates are potentially suited to manipulate the electromagnetic field in highly intense x-ray beams at x-ray free-electron laser sources.	Sep 2019
I13-1-Coherence	Ptychographic characterisation of polymer compound refractive lenses manufactured by additive technology M. Lyubomirskiy , F. Koch , K. A. Abrashitova , V. O. Bessonov , N. Kokareva , A. Petrov , F. Seiboth , F. Wittwer , M. Kahnt , M. Seyrich , A. A. Fedyanin , C. David , C. G. Schroer Optics Express 27, 8639-8650 DOI: 10.1364/OE.27.008639 Diamond Proposal Number(s): [17460] Open Access Show Abstract ▼ Abstract: The recent success in the development of high-precision printing techniques allows one to manufacture free-standing polymer structures of high quality. Two-photon polymerization lithography is a mask-less technique with down to 100 nm resolution that provides full geometric freedom. It has recently been applied to the nanofabrication of X-ray compound refractive lenses (CRLs). In this article we report on the characterization of two sets of CRLs of different design produced by two-photon polymerization-induced lithography.	Mar 2019
I13-1-Coherence	Nanofocusing with aberration-corrected rotationally parabolic refractive X-ray lenses Frank Seiboth , Felix Wittwer , Maria Scholz , Maik Kahnt , Martin Seyrich , Andreas Schropp , Ulrich Wagner , Christoph Rau , Jan Garrevoet , Gerald Falkenberg , Christian G. Schroer Journal Of Synchrotron Radiation 25 DOI: 10.1107/S1600577517015272 Open Access Show Abstract ▼ Abstract: Wavefront errors of rotationally parabolic refractive X-ray lenses made of beryllium (Be CRLs) have been recovered for various lens sets and X-ray beam configurations. Due to manufacturing via an embossing process, aberrations of individual lenses within the investigated ensemble are very similar. By deriving a mean single-lens deformation for the ensemble, aberrations of any arbitrary lens stack can be predicted from the ensemble with [\bar{\sigma}] = 0.034λ. Using these findings the expected focusing performance of current Be CRLs are modeled for relevant X-ray energies and bandwidths and it is shown that a correction of aberrations can be realised without prior lens characterization but simply based on the derived lens deformation. The performance of aberration-corrected Be CRLs is discussed and the applicability of aberration-correction demonstrated over wide X-ray energy ranges.	Dec 2017

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