Göttingen 2025 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 4: AKBP Posters

AKBP 4.16: Poster

Dienstag, 1. April 2025, 16:30–18:00, ZHG Foyer 1. OG

Variation of the laser focus field geometry for direct electron acceleration — •Lars Torben Schwabe, Jan Riedlinger, Marc Osenberg, and Georg Pretzler — Institute of Laser- and Plasmaphysics, Heinrich Heine University Düsseldorf

The field geometry of a laser focus can be engineered by spatially resolved phase and polarization manipulations in the near field. In this work, focal structures with isolated longitudinal fields on axis, surrounded by a ring of transversal fields, are generated. Experimental results of these focal geometries, which match numerical simulations of the 3D field structures, are presented. Furthermore, PIC-simulations were performed to model the interaction of these fields with free electrons, for example in plasma. We discuss the possibilities and conditions for obtaining directed electron acceleration in the longitudinal fields of an ultrashort laser pulse and its properties.

Keywords: laser focus; phase and polarization variation; longitudinal field; ultrashort laser pulse; PIC-simulations