Increased dimensionality of Raman cooling in a slightly nonorthogonal optical lattice

Andreas Neuzner, Stephan Dürr, Matthias Körber, Stephan Ritter, and Gerhard Rempe
Phys. Rev. A 98, 013401 – Published 2 July 2018

Abstract

We experimentally study the effect of a slight nonorthogonality in a two-dimensional optical lattice onto resolved-sideband Raman cooling. We find that when the trap frequencies of the two lattice directions are equal, the trap frequencies of the combined potential exhibit an avoided crossing and the corresponding eigenmodes are rotated by 45 relative to the lattice beams. Hence, tuning the trap frequencies makes it possible to rotate the eigenmodes such that both eigenmodes have a large projection onto any desired direction in the lattice plane, in particular, onto the direction along which Raman cooling works. Using this, we achieve two-dimensional Raman ground-state cooling in a geometry where this would be impossible, if the eigenmodes were not rotated. Our experiment is performed with a single atom inside an optical resonator but this is inessential and the scheme is expected to work equally well in other situations.

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  • Received 17 April 2018
  • Revised 30 May 2018

DOI:https://doi.org/10.1103/PhysRevA.98.013401

©2018 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Andreas Neuzner*, Stephan Dürr, Matthias Körber, Stephan Ritter, and Gerhard Rempe

  • Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany

  • *Present address: OHB System AG, Manfred-Fuchs-Strasse 1, 82234 Weßling, Germany.
  • Present address: TOPTICA Photonics AG, Lochhamer Schlag 19, 82166 Gräfelfing, Germany.

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Issue

Vol. 98, Iss. 1 — July 2018

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