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All optical BEC (by evaporation)

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Group: Lett

Authors and contributors: R. Dumke, J. D. Weinstein, M. Johanning, E. Gomez, L. Turner, K. M. Jones, P. D. Lett

All optical sodium BEC (by evaporation)

The first observation of our sodium all optical-BEC was on 25 March 2005.

The BEC was generated in a crossed beam dipole trap. The trapping beams are produced by a commercial fiber laser which can generate up to 100 W of 1070 nm light. We load initially about 2 x 106 atoms in the crossed region of our trap and start the evaporation by lowering the trapping potential. After a 12.5 second ramp the final atom number in the BEC is 2.5 x 105. Furthermore by just retro-reflecting the trapping beams we are able to produce multiple BEC’s at the same time.

first picture: TOF absorption images of the atomic cloud for diffrent times during the ramp. One can see clearly the transition from the thermal cloud to the BEC.

second picture: TOF absorbtion images of the four crossed dipole traps before the evaporation and after the 12.5 second ramp.

Posted: 22 Aug 2005     Date: 25 Mar 2005


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