Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics I

Q 31.75: Poster

Dienstag, 7. März 2017, 17:00–19:00, P OG1+2

Picosecond Fiber Amplifiers in a MOPA System for Laser Cooling of Relativistic Ion Beams — •Daniel Kiefer, Christian Kühnel, and Thomas Walther — TU-Darmstadt, Institut für Angewandte Physik, Laser und Quantenoptik, Schlossgartenstr. 7, 64289, Darmstadt

Laser cooling of relativistic ion beams has been demonstrated and shown to be a sophisticated technology with achievable low relative momentum spreads [1]. White-light-cooling was proposed as a method to help minimize particle loss due to intra beam scattering (IBS) processes [2] and has been demonstrated for fast stored ion beams [3]. To obtain the required spectral width for laser cooling of relativistic ion beams at GSI (ESR) and FAIR (SIS100, HESR), we plan to use pulsed laser light. A cw MOPA system in combination with acousto-optical and electro-optical modulation provides laser pulses of 50 ns or 70 to 740 ps with a center wavelength of 1030 nm [4]. An efficient fourth harmonic generation process to 257.5 nm demands high peak intensities. Two cascaded fiber amplifiers are used to enhance the energy of the pulses. The setup is chosen so that the amplifier stages work properly for the different pulse lengths covering three orders of magnitude. We show the performance of the amplifiers with regard to power and spectrum. Furthermore, the current status of the experiment will be presented. [1] U. Schramm et al, Proceedings of (2005) Particle Accelerator Conference [2] R. Calabrese, Hyperfine Interactions 99, 259-265, (1996) [3] S. N. Atutov et al, Phys. Rev. Lett. 80, 2129, (1998) [4] D. Kiefer et al, GSI Scientific Report 2015, DOI:10.15120/GR-2016-1