Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 49: Poster – Photonics, Lasers, and Applications

Q 49.24: Poster

Wednesday, March 12, 2025, 17:00–19:00, Tent

Tunable cw UV Laser for Cooling of Relativistic Bunched Ion Beams — •Florian Stein, Jens Gumm, Denise Schwarz, 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. 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 257.25nm for ion beam cooling at ESR in Darmstadt. The laser system can be scanned mode-hop free, via two SHG stages, over 20GHz with a 50 Hz scan rate. In our latest measurements we achieve a power of 2.45W in the UV regime employing a novel elliptical focussing cavity to reduce the degradation effect in BBO. The laser system will be used to minimize the final ion beam momentum spread and, therefore, the ion bunch length.

Keywords: Laser cooling; UV Laser; elliptical focusing