Efficient production of an 87Rb F = 2, mF = 2 Bose-Einstein condensate in a hybrid trap

TL;DR

This paper reports the successful creation of a Bose-Einstein condensate of 87Rb atoms in a hybrid magnetic and optical trap, demonstrating efficient cooling and trapping techniques for quantum gas experiments.

Contribution

It introduces a hybrid trap configuration with enhanced axial confinement, enabling more efficient Bose-Einstein condensation of 87Rb atoms.

Findings

Achieved BEC with 4x10^5 atoms at 0.5 μK

Loaded 2x10^6 atoms from magnetic trap into hybrid trap

Produced thermal clouds of 1x10^6 atoms below 1 μK in optical dipole trap

Abstract

We have realized Bose-Einstein condensation (BEC) of 87Rb in the F=2, m_F=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 2x10^6 atoms at 14 muK 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 muK and with 4x10^5 atoms. We also obtain thermal clouds of 1x10^6 atoms below 1 muK in a pure single beam optical dipole trap, by ramping down the magnetic field gradient after evaporative cooling in the hybrid trap.