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A: Fachverband Atomphysik

A 10: Interaction with VUV and X-ray light

A 10.2: Poster

Tuesday, September 21, 2021, 16:30–18:30, P

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

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. Because in nuclear forward scattering the interference of the sample response with the prompt pulse (fs-ps long) is crucial, the displacement induces a phase shift. This mechanically induced phase shift 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 demonstrate the approach with two examples: the conversion from linear polarization as often provided by synchrotrons to circular polarization and the rotation of linear polarization, which together with a polarimeter can be used for switching within a single experimental cycle.