Cold atom confinement in an all-optical dark ring trap

Details Cold atom confinement in an all-optical dark ring trap Cold atom confinement in an all-optical dark ring trap

2008-02-08

arxiv.org/abs/0802.1213v1

Phys. Rev. A 76, 061404(R) (2007)

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevA.76.061404

We demonstrate confinement of $^{85}$Rb atoms in a dark, toroidal optical trap. We use a spatial light modulator to convert a single blue-detuned Gaussian laser beam to a superposition of Laguerre-Gaussian modes that forms a ring-shaped intensity null bounded harmonically in all directions. We measure a 1/e spin-relaxation lifetime of ~1.5 seconds for a trap detuning of 4.0 nm. For smaller detunings, a time-dependent relaxation rate is observed. We use these relaxation rate measurements and imaging diagnostics to optimize trap alignment in a programmable manner with the modulator. The results are compared with numerical simulations.

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