Efficient production of an 87Rb F = 2, mF = 2 Bose-Einstein condensate in a hybrid trap
LaserLaB, Department of Physics and Astronomy, VU University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
Received: 24 November 2014
Received in final form: 16 January 2015
Published online: 19 February 2015
We have realized Bose-Einstein condensation (BEC) of 87Rb in the F = 2, mF = 2 hyperfine substate in a hybrid trap, consisting of a quadrupole magnetic field and a single optical dipole beam. The symmetry axis of the quadrupole magnetic trap coincides with the optical beam axis, which gives stronger axial confinement than previous hybrid traps. After loading 2 × 106 atoms at 14 μK from a quadrupole magnetic trap into the hybrid trap, we perform efficient forced evaporation and reach the onset of BEC at a temperature of 0.5 μK and with 4 × 105 atoms. We also obtain thermal clouds of 1 × 106 atoms below 1 μK in a pure single beam optical dipole trap, by ramping down the magnetic field gradient after evaporative cooling in the hybrid trap.
Key words: Cold Matter and Quantum Gas
© The Author(s) 2015. This article is published with open access at Springerlink.com