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Proceedings Paper

Rotating a Bose-Einstein condensate using photons with orbital angular momentum
Author(s): Kristian Helmerson; Mikkel F. Andersen; Changhyun Ryu; Pierre Cladé; Vasant Natarajan; Alipasha Vaziri; Azure Hansen; William D. Phillips
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Paper Abstract

We demonstrate the coherent transfer of the orbital angular momentum of a photon to an atom in quantized units of h, using a 2-photon stimulated Raman process with Laguerre-Gaussian beams to generate an atomic vortex state in a Bose-Einstein condensate of sodium atoms. We show that the process is coherent by creating superpositions of different vortex states, where the relative phase between the states is determined by the relative phases of the optical fields. Furthermore, we create vortices of charge 2 by transferring to each atom the orbital angular momentum of two photons. We subsequently use our technique to induce rotation of the condensate confined in an asymmetric, ring-shaped hybrid optical and magnetic trap. We observe the cloud rotating for up to 13 seconds, due to the superfluid character of the condensate.

Paper Details

Date Published: 11 September 2006
PDF: 9 pages
Proc. SPIE 6326, Optical Trapping and Optical Micromanipulation III, 632603 (11 September 2006); doi: 10.1117/12.681608
Show Author Affiliations
Kristian Helmerson, National Institute of Standards and Technology (United States)
Mikkel F. Andersen, National Institute of Standards and Technology (United States)
Changhyun Ryu, National Institute of Standards and Technology (United States)
Pierre Cladé, National Institute of Standards and Technology (United States)
Vasant Natarajan, National Institute of Standards and Technology (United States)
Alipasha Vaziri, Institut für Quantenoptik und Quanteninformation (Austria)
Azure Hansen, National Institute of Standards and Technology (United States)
William D. Phillips, National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 6326:
Optical Trapping and Optical Micromanipulation III
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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