Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 20: Ultra-cold atoms, ions and BEC V (with Q)
A 20.8: Vortrag
Donnerstag, 17. März 2011, 12:15–12:30, BAR 106
(contribution withdrawn) Gauge fields for ultra-cold Ytterbium atoms — •Sebastian Krinner1,2, Fabrice Gerbier1, Jerôme Beugnon1, and Jean Dalibard1 — 1Laboratoire Kastler Brossel, 24 rue Lhomond, 75005 Paris, France — 2Institute for Quantum Electronics, ETH Zürich, Hönggerberg, CH-8093 Zürich, Switzerland
Cold atoms in optical lattices can serve as model systems for condensed matter physics. In our project we plan to investigate the rich physics of fractional quantum Hall phases. I will first briefly explain the core of the planned experiment, i.e. the implementation of a strong U(1)-like gauge field on cold Ytterbium atoms confined in a two-dimensional square lattice.
The second part focuses on the laser cooling of Yb. It consists of Zeeman slowing of an atomic beam using the strong singlet transition at 399nm and subsequent magneto-optical trapping using the green intercombination line at 556nm. Both laser wavelengths are produced via the technique of second-harmonic generation. As a showcase I will treat the generation of the 556nm light relying on intra-cavity frequency doubling of a 2W fiber laser at 1112nm. The output power of 1.2W corresponds to 80% efficiency and suggests an alternative to dye lasers.