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Q: Fachverband Quantenoptik und Photonik
Q 49: Poster – Photonics, Lasers, and Applications
Q 49.12: Poster
Mittwoch, 12. März 2025, 17:00–19:00, Tent
Tunable Pulsed UV-Laser System for Laser Cooling of Highly Charged Bunched Ion Beams Employing Walk-Off Compensation — •Tamina Grunwitz1, Benedikt Langfeld1,2, and Thomas Walther1,2 — 1TU Darmstadt — 2HFHF Campus Darm stadt, Department for Atomic and Plasma Physics
Laser cooling of bunched ion beams is a promising technique for narrowing the relative momentum distribution of highly charged ions in accelerators. To achieve efficient laser cooling at the new SIS100 of the GSI FAIR facility, in addition to a continuous laser, two pulsed lasers are planned to be used which, due to their spectral bandwidth, can cool a large part of the ion ensemble. For a flexible application all laser systems should be continuoulsy tunable in their wavelength in the UV region. In this contribution, we present our tunable pulsed laser system in the UV range of 257 nm. In order to achieve a high tunability of the whole system, the wavelength in the IR can be continuouly tuned over a range of 3 nm around a centre wavelength of 1030 nm. With the use of two SHG stages, the IR light can be converted into the UV regime. Automated phasematching (critical) of the used BBO crystal allows continuous tuning of the UV wavelength. To compensate the beam offset due to wavelength change, a walk-off compensated setup of two BBO crystals is used, which provides a better stability of the UV beam position during tuning. In this work, we will present our most recent results regarding the automatic tuning of the wavelength in the UV with this setup, as well as the beam movement with change in wavelength
Keywords: UV laser; laser cooling