Cold atom confinement in an all-optical dark ring trap
| Autor: | Olson, Spencer E., Terraciano, Matthew L., Bashkansky, Mark, Fatemi, Fredrik K. |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Phys. Rev. A 76, 061404(R) (2007) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.76.061404 |
| Popis: | 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. Comment: 5 pages, 4 figures |
| Databáze: | arXiv |
| Externí odkaz: |
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