Doppler cooling of an optically dense cloud of trapped atoms

Details Doppler cooling of an optically dense cloud of trapped atoms Doppler cooling of an optically dense cloud of trapped atoms

2002-08-20

arxiv.org/abs/quant-ph/0208129v1

Physics

Quantum Physics

8 pages 7 figures

Scientific paper

10.1364/JOSAB.20.000960

We have studied a general technique for laser cooling a cloud of polarized trapped atoms down to the Doppler temperature. A one-dimensional optical molasses using polarized light cools the axial motional degree of freedom of the atoms in the trap. Cooling of the radial degrees of freedom can be modelled by reabsorption of scattered photons in the optically dense cloud. We present experimental results for a cloud of chromium atoms in a magnetic trap. A simple model based on rate equations shows quantitative agreement with the experimental results. This scheme allows us to readily prepare a dense cloud of atoms in a magnetic trap with ideal starting conditions for evaporative cooling.

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