Erlangen 2022 – scientific programme

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A: Fachverband Atomphysik

A 14: Interaction with VUV and X-ray light

A 14.4: Talk

Wednesday, March 16, 2022, 11:30–11:45, A-H1

Fast resonant adaptive x-ray optics via mechanically-induced refractive-index enhancements — •Miriam Gerharz and Jörg Evers — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

In this project we introduce a concept for fast resonant adaptive x-ray optics. Using piezo-control methods, we can displace a solid-state target much faster than the lifetime of its resonances. This creates a mechanically-induced phase shift, that can be associated with an additional contribution on resonance to the real part of the refractive index while the imaginary part remains unchanged. Hence, we can achieve polarization control by mechanically-induced birefringence without changes in absorption. We theoretically and experimentally demonstrate the approach with a x-ray polarization interferometer, in which the interference is controlled by the mechanically-induced birefringence. This setup can be used for temporal gating and provides a sensitive tool for a noise background analysis on sub-Ångstrom level.