SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 59: Poster IV

Q 59.78: Poster

Thursday, March 9, 2023, 16:30–19:00, Empore Lichthof

Novel tunable cw UV laser system for laser cooling of bunched relativistic ion beams — •Jens Gumm, Jonas Moos, and Thomas Walther — TU Darmstadt

Experiments with highly charged ions at relativistic energies are of great interest for many atomic and nuclear physics experiments at accelerator facilities. In order to decrease the longitudinal momentum spread and emittance, laser cooling has proven to be a powerful tool.
In this work, we present a cw UV laser system operating at 257.25 nm for ion beam cooling at the ESR at GSI. The laser system will be used to minimize the final ion beam momentum spread and, therefore, the ion bunch length.
The laser can be scanned mode-hop free, via two SHG stages, over 20 GHz with a 50 Hz scan rate. In our latest measurements, we achieve a power of 1.7 W in the UV regime employing a novel elliptical focussing cavity to reduce the degradation effect in BBO.