Rapid production of $^{87}$Rb BECs in a combined magnetic and optical potential

Details Rapid production of $^{87}$Rb BECs in a combined magnetic and optical potential Rapid production of $^{87}$Rb BECs in a combined magnetic and optical potential

2009-04-21

arxiv.org/abs/0904.3314v1

Physics

Condensed Matter

Quantum Gases

Scientific paper

We describe an apparatus for quickly and simply producing $\Rb87$ Bose-Einstein condensates. It is based on a magnetic quadrupole trap and a red detuned optical dipole trap. We collect atoms in a magneto-optical trap (MOT) and then capture the atom in a magnetic quadrupole trap and force rf evaporation. We then transfer the resulting cold, dense cloud into a spatially mode-matched optical dipole trap by lowering the quadrupole field gradient to below gravity. This technique combines the efficient capture of atoms from a MOT into a magnetic trap with the rapid evaporation of optical dipole traps; the approach is insensitive to the peak quadrupole gradient and the precise trapping beam waist. Our system reliably produces a condensate with $N\approx2\times10^6$ atoms every $16\second$.

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