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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 5: Laser Systems and Laser Applications
K 5.1: Vortrag
Mittwoch, 11. März 2020, 11:00–11:15, f428
Generation of Amplified Fourth Harmonic Picosecond Laser Pulses for Cooling of Relativistic Ion Beams at GSI and FAIR — •Thomas Werner1, Sebastian Hepp1, Daniel Kiefer1, Sebastian Klammes1,2, and Thomas Walther1 — 1TU-Darmstadt, Institut für Angewandte Physik, Laser und Quantenoptik, Schlossgartenstr. 7, 64289, Darmstadt — 2GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt
White-light cooling of relativistic ion beams promises to be an efficient and effective means to obtain low momentum spreads [1] with minimized intrabeam scattering (IBS) processes [2]. A cw ECDL laser system in combination with acousto-optical and electro-optical modulation provides short pulse lenghts of 50ps to 740ps [3] in order to generate the required spectral width. The doppler shifted transition wavelength of 275.5nm of relativistic ions is generated in two consecutive SHG processes that require high peak intensities. Therefore, the modulated laser pulses are amplified in a series of three*Ytterbium-doped*fiber amplifiers. We will present the current status of the experiment and future developments. [1] U. Schramm et al, Proceedings of (2005) Particle Accelerator Conference, [2] R. Calabrese, Hyperfine Interactions 99, 259-265,(1996), [3] D. Kiefer and T. Walther, "Picosecond Ultraviolet Pulses at 257 nm with Variable Transform Limited Linewidth and Flexible Repetition Rate," in Laser Congress 2018 (ASSL), OSA Technical Digest (Optical Society of America, 2018), paper AW1A.2.