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Applied Physics B

Method for obtaining high phase space density in a surface-mounted atom trap

Andriy Shevchenko, A. Jaakkola, Thomas Lindvall, Ilkka Juhani Tittonen, M. Kaivola

Published Jun 10, 2004• 2 citations
Publisher
DOI
10.1007/s00340-004-1556-9

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We report a method for loading cold atoms into an optical trap with high initial phase-space density (PSD). When the trap beam is overlapped with atoms in optical molasses of optimized parameters including large cooling beam detuning compared with conventional detuning used for a magneto-optical trap (MOT), more than $3\ifmmode\times\else\texttimes\fi{}{10}^{6}$ rubidium atoms with an initial temperature less than 20 $\ensuremath{\mu}\mathrm{K}$ are loaded into a single beam trap. The obtained maximum initial PSD is estimated to be $1.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, which is one or two orders of magnitude greater than that achieved with the conventional loading into an optical trap from atoms in a MOT. The proposed method is promising for creating a quantum gas with a large number of atoms in a short evaporation time.