Volume 71, Number 6, September 2005
|Page(s)||918 - 924|
|Section||Atomic and molecular physics|
|Published online||24 August 2005|
Depolarisation cooling of an atomic cloud
5. Physikalisches Institut, Universität Stuttgart Pfaffenwaldring 57, 70550 Stuttgart, Germany
Accepted: 19 July 2005
We propose a cooling scheme based on depolarisation of a polarised cloud of trapped atoms. Similar to adiabatic demagnetisation, we suggest to use the coupling between the internal spin reservoir of the cloud and the external kinetic reservoir via dipolar relaxation to reduce the temperature of the cloud. By optical pumping one can cool the spin reservoir and force the cooling process. In case of a trapped gas of dipolar chromium atoms, we show that this cooling technique can be performed continuously and used to approach the critical phase space density for BEC.
PACS: 39.25.+k – Atom manipulation (scanning probe microscopy, laser cooling, etc.) / 34.50.-s – Scattering of atoms and molecules / 32.80.Pj – Optical cooling of atoms; trapping
© EDP Sciences, 2005
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