Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 10: Poster Session I

P 10.32: Poster

Dienstag, 1. April 2025, 16:15–18:15, ZHG Foyer 1. OG

Plasma-based volume holograms for creation of relativistic Gauss-Laguerre laser beams — •Götz Lehmann and Karl-Heinz Spatschek — Heinrich-Heine-Universität Düsseldorf

Gauss-Laguerre (GL) laser beams have received growing interest in the field of high-intensity laser-plasma interactions over the past years due to their particular doughnut-like intensity distribution, their particular field configuration in the focal region and also for their orbital angular momentum. At moderate intensites, i.e. far away from the ionization-threshold of any material and thus even further away from the (relativistic) intensities discussed in literature, GL beams are obtained e.g. by passing a Gaussian beam through a spiral phase plate, imprinting a helical structure on the phase distribution within the beam. For relativistic focal intensities such solid-state material solutions are not feasible. Plasma-based holograms offer an alternative route to mode conversion. In our work, we show how to write transient plasma density gratings into underdense plasma that then subsequently will act as a hologram and convert Gaussian laser pulses into LG pulses of relativistic intensities.

Keywords: Laser-plasma interaction; coherent radiation source; Gauss-Laguerre beams; structured light; plasma density gratings