SAMOP 2021 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 6: Atomic systems in external fields

A 6.3: Poster

Dienstag, 21. September 2021, 16:30–18:30, P

Free electron vortices meet optical vortex beams: Analogies and Differences — •Darius Köhnke¹, Kevin Eickhoff¹, Lea-Christin Feld¹, Stefanie Kerbstadt^1,2, Lars Englert¹, Tim Bayer¹, and Matthias Wollenhaupt¹ — ¹Carl von Ossietzky Universität Oldenburg, Carl-von-Ossietzky-Straße 9-11, D-26129 Oldenburg, Germany — ²Center for Free-Electron Laser Science (CFEL), Deutsches Elektronen Synchrotron DESY, Notkestraße 85, D-22607 Hamburg, Germany

In recent years, vortex states have attracted significant interest in various fields of physics ranging from fundamental studies of light-matter interaction to advanced optical applications. Here, we present a comparative study of free electron vortices created by atomic multiphoton ionization and optical vortex beams generated with a holographic technique. On the one hand we use spectral pulse shaping to generate polarization-tailored carrier-envelope phase stable bichromatic laser pulses creating photoelectron vortices. On the other hand we employ computer generated holograms for spatial tailoring of a laser beam forming optical vortex beams. While both methods can be interpreted as an advanced double slit experiment in either the spectral or spatial domain, the resulting topological properties of the vortex states are quite different. We discuss the different topological properties as well as their manipulation. Further we demonstrate control of the symmetry and orientation of the vortex states in both scenarios.