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

TL;DR

This paper presents a rapid and simple method for producing $^{87}$Rb Bose-Einstein condensates using a combined magnetic and optical trapping system, achieving high atom numbers efficiently.

Contribution

The authors introduce a novel combined magnetic and optical trapping technique that enables quick production of large $^{87}$Rb BECs with minimal sensitivity to trap parameters.

Findings

Produces $2 imes 10^6$ atoms in 16 seconds

Method is insensitive to trap gradient and beam waist

Reliable and rapid BEC production

Abstract

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 $16\second$.