Laser-cooled atoms inside a hollow-core photonic-crystal fiber

Abstract

We describe the loading of laser-cooled rubidium atoms into a single-mode hollow-core photonic-crystal fiber. Inside the fiber, the atoms are confined by a far-detuned optical trap and probed by a weak resonant beam. We describe different loading methods and compare their trade-offs in terms of implementation complexity and atom-loading efficiency. The most efficient procedure results in loading of ~30,000 rubidium atoms, which creates a medium with optical depth ~180 inside the fiber. Compared to our earlier study this represents a six-fold increase in maximum achieved optical depth in this system.

10 pages, 9 figures

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• Crystallization of strongly interacting photons in a nonlinear optical fiber
• Low-Light-Level Optical Interactions with Rubidium Vapor in a Photonic Bandgap Fiber
• Trapping of Ultracold Atoms in a Hollow-core Photonic Crystal Fiber
• Bose-Einstein condensation of stationary-light polaritons
• Confining stationary light: Dirac dynamics and Klein tunneling
• Efficient Guiding of Cold Atoms though a Photonic Band Gap Fiber

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