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A Shack-Hartmann sensor for single-shot multi-contrast imaging with hard X-rays

Rolo, Tomy dos Santos; Reich, Stefan; Karpov, Dmitry; Gasilov, Sergey; Kunka, Danays; Fohtung, Edwin; Baumbach, Tilo; Plech, Anton

Abstract (englisch):
An array of compound refractive X-ray lenses (CRL) with 20x20 lenslets, a focal
distance of 20 cm and a visibility of 0.93 is presented. It can be used as a ShackHartmann sensor for hard X-rays (SHARX) for wavefront sensing and permits for true
single-shot multi-contrast imaging the dynamics of materials with a spatial resolution
in the micrometer range, sensitivity on nanosized structures and temporal resolution
on the microsecond scale. The object’s absorption and its induced wavefront shift can
be assessed simultaneously together with information from diffraction channels. This
enables the imaging of hierarchical materials. In contrast to the established Hartmann
sensors the SHARX has an increased flux efficiency through focusing of the beam rather
than blocking parts of it. We investigated the spatiotemporal behavior of a cavitation
bubble induced by laser pulses. Furthermore, we validated the SHARX by measuring
refraction angles of a single diamond CRL, where we obtained an angular resolution
better than 4 µrad.

Zugehörige Institution(en) am KIT Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator URN: urn:nbn:de:swb:90-820633
KITopen ID: 1000082063
HGF-Programm 56.03.20; LK 01
Erschienen in arxiv
Seiten 1802.10045
Schlagworte X-ray optics, X-ray imaging, Phase contrast, multi contrast imaging, x-ray lens array, Shack-Hartman sensor
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