Phys. Rev. Lett. 81, 2194–2197 (1998)Reversible Formation of a Bose-Einstein CondensateReceived 1 May 1998; published in the issue dated 14 September 1998 We present a method of adiabatically changing the local phase-space density of an ultracold gas using a combination of magnetic and optical forces. Applying this method, we observe phase-space density increases in a gas of sodium atoms by as much as 50-fold. The transition to Bose-Einstein condensation was crossed reversibly, attaining condensate fractions of up to 30%. Measurements of the condensate fraction reveal its reduction due to interactions. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.2194
DOI:
10.1103/PhysRevLett.81.2194
PACS:
03.75.Fi, 05.30.-d, 32.80.Pj
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