Bose–Einstein condensation in large time-averaged optical ring potentials

Bell, Thomas A, Glidden, Jake A P, Humbert, Leif, Bromley, Michael W J, Haine, Simon A, Davis, Matthew J, Neely, Tyler W, Baker, Mark A and Rubinsztein-Dunlop, Halina (2016) Bose–Einstein condensation in large time-averaged optical ring potentials. New Journal of Physics, 18 (3). p. 5003. ISSN 1367-2630

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Interferometric measurements with matter waves are established techniques for sensitive gravimetry, rotation sensing, and measurement of surface interactions, but compact interferometers will require techniques based on trapped geometries. In a step towards the realisation of matter wave interferometers in toroidal geometries, we produce a large, smooth ring trap for Bose–Einstein condensates using rapidly scanned time-averaged dipole potentials. The trap potential is smoothed by using the atom distribution as input to an optical intensity correction algorithm. Smooth rings with a diameter up to 300 μm are demonstrated. We experimentally observe and simulate the dispersion of condensed atoms in the resulting potential, with good agreement serving as an indication of trap smoothness. Under time of flight expansion we observe low energy excitations in the ring, which serves to constrain the lower frequency limit of the scanned potential technique. The resulting ring potential will have applications as a waveguide for atom interferometry and studies of superfluidity.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Atomic, Molecular and Optical Physics Research Group
Subjects: Q Science > QC Physics
Depositing User: Richard Chambers
Date Deposited: 12 Jan 2017 11:00
Last Modified: 06 Mar 2017 20:32

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