Berlin 2005 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 20: Poster Fallen & Kühlung

Q 20.11: Poster

Montag, 7. März 2005, 11:00–12:30, Poster HU

Cooling atomic motion in an optical resonator — •Stefano Zippilli¹ and Giovanna Morigi² — ¹Abteilung für Quantenphysik, Universität Ulm, D-89069 Ulm, Germany — ²Departament de Fisica, Universitat Autonoma de Barcelona, 08193 Bellaterra, Spain

We investigate the dynamics of laser cooling of atoms whose dipole transition couples to a mode of a high-finesse optical resonator and is driven by a transverse laser. We show that, in the presence of an external trapping potential, the center-of-mass motion of the atoms can be efficiently cooled to the ground state even when the atomic parameters do not allow for sideband cooling. Our mechanism exploits an interference effect between cavity field and laser, thereby achieving large cooling efficiencies in the strong coupling regime.

We derive an equation for the center-of-mass motion in the Lamb–Dicke limit by adiabatically eliminating the internal degrees of freedom. The theoretical predictions are discussed for experimental parameters and are compared to a numerical simulation of the full quantum mechanical model.