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Cold Atom Confinement in an All-optical Dark Ring Trap by Olson, Spencer E.; Terraciano, Matthew L.; Bashkansky, Mark; Fatemi, Fredrik K. is a scholarly article available to read on EtoBox.

What is Cold Atom Confinement in an All-optical Dark Ring Trap about?

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.

Author

Olson, Spencer E.; Terraciano, Matthew L.; Bashkansky, Mark; Fatemi, Fredrik K.

Published

2008

Language

EN