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Hard X-ray wavefront correction via refractive phase plates made by additive and subtractive fabrication techniques

 
: Seiboth, F.; Brückner, D.; Kahnt, M.; Lyubomirskiy, M.; Wittwer, F.; Dzhigaev, D.; Ullsperger, T.; Nolte, S.; Koch, F.; David, C.; Garrevoet, J.; Falkenberg, G.; Schroer, C.G.

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Fulltext ()

Journal of synchrotron radiation 27 (2020), pp.1121-1130
ISSN: 0909-0495
ISSN: 1600-5775
English
Journal Article, Electronic Publication
Fraunhofer IOF ()
aberration correction; phase plate; ptychography; diffractive-refractive X-ray optics

Abstract
Modern subtractive and additive manufacturing techniques present new avenues for X-ray optics with complex shapes and patterns. Refractive phase plates acting as glasses for X-ray optics have been fabricated, and spherical aberration in refractive X-ray lenses made from beryllium has been successfully corrected. A diamond phase plate made by femtosecond laser ablation was found to improve the Strehl ratio of a lens stack with a numerical aperture (NA) of 0.88 × 10−3 at 8.2 keV from 0.1 to 0.7. A polymer phase plate made by additive printing achieved an increase in the Strehl ratio of a lens stack at 35 keV with NA of 0.18 × 10−3 from 0.15 to 0.89, demonstrating diffraction-limited nanofocusing at high X-ray energies.

: http://publica.fraunhofer.de/documents/N-621645.html