Göttingen 2025 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 4: AKBP Posters

AKBP 4.9: Poster

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

Generation of few-cycle laser pulses via HCF-based compression for pump probe experiments in plasma-based accelerators — •Onur Bilen, Marc Osenberg, Mirela Cerchez, Edgar Hartmann, Paula Sedlatschek, and Bernhard Hidding — Institute of laser- und plasmaphysics, Heinrich Heine University Düsseldorf

Generating ultrashort laser pulses is essential for resolving femtosecond-timescale dynamics in plasma-based particle accelerators. Here we present a hollow-core fiber setup designed to achieve sub-10 femtosecond pulses with a record-breaking pulse energy output of at least 2 millijoule. These ultrashort laser pulses will be utilized to visualize the acceleration process of electrons within a plasma wake via shadowgraphy. To create an ultrashort pulse, multiple light frequencies must overlap constructively, the more frequencies the shorter the pulse. To introduce more frequencies into a pulse, a nonlinearity known as self-phase modulation is employed. Self-phase modulation requires an intense, short laser pulse and a material with strong third-order nonlinearity. Noble gases such as neon and argon have shown sufficiently strong third-order nonlinear behaviour and are widely used for spectral broadening. The necessary intensity is achieved by focusing the light down to a smaller beam diameter. A hollow-core fiber is used to maintain a small beam diameter over a longer distance and to clean the spatial profile of the pulse. The spectrally broadened pulse can then be compressed to sub-10 femtoseconds using chirped mirrors and used for shadowgraphy.

Keywords: ultrashort laser pulses; shadowgraphy; plasma wakefield accelerator; hollow-core fiber