Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 41: Poster – Quantum Technologies II & Laser Technology
Q 41.18: Poster
Wednesday, March 4, 2026, 17:00–19:00, Philo 2. OG
Pulsed UV Laser System for Laser Cooling of Relativistic Bunched Ion Beams — •Harri Lara1, Tamina Grunwitz1,2, Benedikt Langfeld1,2, and Thomas Walther1,2 — 1TU Darmstadt — 2HFHF Campus Darmstadt
At FAIR's synchrotron SIS100, laser cooling is the planned method for narrowing the momentum distribution of relativistic bunched ion beams. Due to the specific demands of the SIS100, three lasers will be used: Two pulsed lasers for pre-cooling that can address ions over a wide range of velocity classes due to their spectral width and one continuous wave laser to further cool the ions to the coldest temperatures.
In this contribution, we present our pulsed UV laser system with a centre wavelength of 257 nm. For the purposes of laser cooling application, the UV pulsed system produces pulses between 46 and 734 ps with a repetition rate between 1 and 10 MHz. Additionally, an average power output of 5.3 W has been achieved at 257 nm. Since the construction of this pulsed laser system, we have begun to duplicate it for use at the SIS100 and we will also present the progress made on the development of this duplicated system.
Keywords: UV pulsed laser; Laser cooling