Berlin 2001 – scientific programme

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Q: Quantenoptik

Q 17: Poster: Cooling and Trapping

Q 17.14: Poster

Wednesday, April 4, 2001, 12:30–15:00, AT2

Collective light forces on atoms in a high-finesse cavity — •Peter Maunz, Thomas Fischer, Thomas Puppe, Pepijn Pinkse, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany

We study the motion of point-like two-level atoms in an externally pumped cavity field. For low saturation of the atoms, we obtain analytical expressions for the dipole force, the velocity-dependent force and the momentum diffusion coefficient for each atom in the presence of the other atoms[1]. We compare the results of simulations based on these formulas with a recent experiment[2], where the transmission of the coupled atoms-cavity system was measured for different parameters. An application of these many-atom forces is the cooling of (ensembles of) particles without closed transitions, because in this strongly coupled system, dissipation is provided by spontaneous decay of the cavity field.

[1] We follow the approach of P. Horak, G. Hechenblaikner, K.M. Gheri, H. Stecher, and H. Ritsch, Phys. Rev. Lett. 79, 4974 (1997)

[2] P. Münstermann, T. Fischer, P. Maunz, P.W.H. Pinkse, and G. Rempe, Phys. Rev. Lett. 84, 4068 (2000)