Düsseldorf 2007 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 14: Poster I - Ultra-cold atoms, ions and BEC

A 14.6: Poster

Dienstag, 20. März 2007, 16:30–18:30, Poster B

EIT-based cooling of neutral atoms — •Maryam Roghani and Hanspeter Helm — Department of molecular and optical physics, Stefan-Meier-Str. 19,D-79104 Freiburg,Germany

The concept of EIT has recently been discussed as a means of cooling neutral trapped atoms [1]. We attempt to evaluate this scheme under using realistic parameters as they are present in an optical dipole trap for Rb atoms and discuss the potential sensitivity of the cooling scheme using a realistic multi-level atom. Specifically we wish to address likely limitations in the applicability of the EIT scheme for neutral atom traps. Such limitations arise from a variety of reasons. Among these are: a) the low vibrational frequencies of atoms in dipole traps, b) the effect of anharmonicities (these appear naturally from the intensity profile of the laser beam but also due to the gravitational potential and the mean field of interaction), c) the substantial difference in vibrational frequencies for ground and excited state atoms (unless the trap is operated at a magic wavelength for which the AC-Stark shifts of ground and excited state are identical), d) the sensitivity of the scheme to residual magnetic fields and to fluctuations of the laser fields, e) the necessity of an artificially introduced spatial dependence of the transistion dipole moment in order to enforce off-diagonal vibrational transitions. [1]. F. Schmidt - Kaler, J. Eschner, G. Morigi, C. F. Roos, D. Leibfried, A. Mundt, R. Blatt, Laser cooling with electromagnetically induced transparency: application to trapped samples of ions or neutral atoms. Appl. Phys. B 73, 807 (2001).