Stuttgart 2012 – wissenschaftliches Programm
Q 17.7: Vortrag
Montag, 12. März 2012, 18:00–18:15, V7.02
Cavity cooling below the recoil limit — •Matthias Wolke, Hans Keßler, Jens Klinder, and Andreas Hemmerich — Institut für Laser-Physik, Universität Hamburg, Germany
We study the controlled excitation of a Bose-Einstein-condensate (BEC) into momentum states of ± 2ℏ k and the cooling back to zero momentum. In our system a BEC of 87Rb is dispersively coupled to the mode of an ultra-high-finesse standing wave cavity with narrow linewidth (≈ 9 kHz). Exploiting the cavity enhanced scattering we deposit energy (4 Erecoil ≈ h· 14 kHz) into the BEC by illuminating it with a laser blue detuned to the cavity resonance. This can be reversed by switching the detuning to the red flank of the cavity and thereby cool the atoms efficiently down to zero momentum.