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A: Fachverband Atomphysik

A 26: Posters: BECs, ultracold gases and plasmas

A 26.2: Poster

Donnerstag, 13. März 2008, 16:30–18:30, Poster C3

EIT cooling beyond the Lamb Dicke limit — •Maryam Roghani and Hanspeter Helm — Department of Molecular and Optical Physics, Stefan-Meier-Straße 19, D-79104 Freiburg

Morigi et al have shown, that by applying two laser beams to a trapped atomic sample in a way that EIT(Electromagnetically Induced Transparency) condition is satisfied, there is the a possibility of cooling the sample to the ground state of the trap[1].This scheme proves highly efficient in case of cooling ions in tight traps when the condition of small Lamb-Dicke parameter and the condition of spontaneous emission rate smaller than trap frequency can be met.Transferring this scheme to typical cases of neutral atoms trapped in optical dipole trap environments neither of these conditions can be stringently met. In the neutral atom case typical values of the Lamb-Dicke parameter are in the range of 0.2-1 and spontaneous emission rate is much greater than trap frequency. We explore this situation by developing the Liouville equation for a density matrix describing states of the vibrational and electronic motion of the sample by taking into account the modification of the EIT line-shape due to vibrationally off-diagonal transitions in emission and absorption. [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).