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

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posted on 2023-06-09, 04:39 authored by Thomas A Bell, Jake A P Glidden, Leif Humbert, Michael W J Bromley, Simon A Haine, Matthew J Davis, Tyler W Neely, Mark A Baker, Halina Rubinsztein-Dunlop
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.

History

Publication status

  • Published

File Version

  • Published version

Journal

New Journal of Physics

ISSN

1367-2630

Publisher

IOP Publishing

Issue

3

Volume

18

Page range

5003

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Atomic, Molecular and Optical Physics Research Group Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2017-01-12

First Open Access (FOA) Date

2017-01-12

First Compliant Deposit (FCD) Date

2017-01-12

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