Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 41: Poster – Quantum Technologies II & Laser Technology
Q 41.23: Poster
Wednesday, March 4, 2026, 17:00–19:00, Philo 2. OG
Continuous Wave UV Laser System for Cooling Relativistic Bunched Ions — •Denise Schwarz1, Jens Gumm1, and Thomas Walther1,2 — 1Technische Universität Darmstadt — 2HFHF Darmstadt
Bunched relativistic ion beams with a narrow momentum distribution are essential for precision experiments at modern accelerator facilities. Laser cooling presents a promising approach to further reduce the relative momentum distribution of such ion beams.
This work presents the high power UV cw laser system for laser cooling at the SIS100 at FAIR. The laser system can be scanned without experiencing mode-hops over 25 GHz in the infrared. In two cavities, frequency conversion is employed to achieve the necessary wavelength of 257 nm for laser cooling. The second enhancement cavity employs an elliptical focus to avoid degradation of the BBO crystal while achieving a high an stable output in the UV.
Keywords: Laser cooling; UV laser; Relativistic ion beams; Laser development; Accelerator physics