Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 16: Laser Developments and Applications

Q 16.2: Talk

Monday, March 11, 2019, 14:15–14:30, S SR 211 Maschb.

Transform Limited Pulse Amplification in an Ytterbium Doped Photonic Crystal Fibre — •Sebastian Hepp, Daniel Kiefer, and Thomas Walther — TU Darmstadt, Institut für Angewandte Physik, Laser- und Quantenoptik, Schlossgartenstr. 7, 64289 Darmstadt

For precision experiments in the heavy ion storage ring ESR at GSI and in the future heavy ion synchrotron SIS100 at FAIR in Darmstadt, beams of high brilliance are desirable. A crucial element to achieving this is reducing the momentum spread of the relativistic ions, which has been successfully accomplished at GSI using conventional laser cooling [1]. White light laser cooling has proven to be an even more efficient method for not only cooling but also suppressing intra beam scattering leading to a reduced particle loss [2].

For this purpose, we have implemented a laser system providing transform limited pulses with variable length at 257.5 nm. A continuous wave MOPA system with subsequent acousto-optical and electro-optical modulation generates pulses at 1030 nm with variable length from 70 ps up to 740 ps. Three consecutive fibre amplifiers are used to increase the pulse energy to a suitable level for efficient fourth harmonic generation. As self phase modulation limits our system, one of the fibre amplifiers has been replaced by a photonic crystal fibre with larger mode field diameter. The current status of the system is presented.

[1] D. Winters et al, Phys. Scr. T166 (2015), 014048.

[2] S. N. Atutov et al, Phys. Rev. Lett. 80 (1998), 2129-2132.