9 February 2007 Single-beam, dark toroidal optical traps for cold atoms
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We demonstrate the generation of single-beam dark toroidal optical intensity distributions, which are of interest for neutral atom storage and atom interferometry. We demonstrate experimentally and numerically optical potentials that contain a ring-shaped intensity minimum, bounded in all directions by higher intensity. We use a spatial light modulator to alter the phase of an incident laser beam, and analyze the resulting optical propagation characteristics. For small toroidal traps (< 50 &mgr;m diameter), we find an optimal superposition of Laguerre-Gaussian modes that allows the formation of single-beam toroidal traps. We generate larger toroidal bottle traps by focusing hollow beams with toroidal lenses imprinted onto the spatial light modulator.
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Fredrik K. Fatemi, Spencer E. Olson, Mark Bashkansky, Zachary Dutton, Matthew Terraciano, "Single-beam, dark toroidal optical traps for cold atoms", Proc. SPIE 6483, Complex Light and Optical Forces, 648307 (9 February 2007); doi: 10.1117/12.701078; https://doi.org/10.1117/12.701078


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