Phys. Rev. A 71, 033617 (2005) [5 pages]Optically plugged quadrupole trap for Bose-Einstein condensatesReceived 9 September 2004; published 14 March 2005 We created sodium Bose-Einstein condensates in an optically plugged quadrupole magnetic trap. A focused, 532-nm laser beam repelled atoms from the coil center where Majorana loss is significant. We produced condensates containing up to 3×107 atoms, a factor of 60 improvement over previous work and a number comparable to the best all-magnetic traps, and transferred up to 9×106 atoms into a purely optical trap. We compare our observations with a simple model of evaporative cooling, concluding that a laser in the range of 1 W (rather than 5 W) may suffice. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.71.033617
DOI:
10.1103/PhysRevA.71.033617
PACS:
03.75.Mn, 03.75.Nt, 32.80.Lg, 32.80.Pj
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