Rubidium 87 Bose-Einstein condensate in an optically plugged quadrupole trap

Details Rubidium 87 Bose-Einstein condensate in an optically plugged quadrupole trap Rubidium 87 Bose-Einstein condensate in an optically plugged quadrupole trap

2011-12-03

arxiv.org/abs/1112.0660v1

Physics

Condensed Matter

Quantum Gases

13 pages, 8 figures

Scientific paper

We describe an experiment to produce 87Rb Bose-Einstein condensates in an optically plugged magnetic quadrupole trap, using a standard 532 nm laser. Due to the large detuning of the plug laser with respect to the atomic transition, the evaporation has to be carefully optimized in order to efficiently overcome the Majorana losses. We provide a complete theoretical and experimental study of the trapping potential at low temperatures and show that this simple model describes well our data. In particular we demonstrate methods to reliably measure the trap oscillation frequencies and the bottom frequency, based on periodic excitation of the trapping potential and on radio-frequency spectroscopy, respectively. We show that this hybrid trap can be operated in a well controlled regime that allows a reliable production of degenerate gases.

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