Guiding of cold atoms by a red-detuned laser beam of moderate power

Details Guiding of cold atoms by a red-detuned laser beam of moderate power Guiding of cold atoms by a red-detuned laser beam of moderate power

2002-01-30

arxiv.org/abs/physics/0201068v3

New J. Phys. 4, 1.1-1.10 (2002)

Physics

Atomic Physics

final version, 6 pages, incl. 6 figures

Scientific paper

10.1088/1367-2630/4/1/369

We report measurements on the guiding of cold $^{87}$Rb atoms from a magneto-optical trap by a continuous light beam over a vertical distance of 6.5 mm. For moderate laser power ($<$85 mW) we are able to capture around 40% of the cold atoms. Although the guide is red-detuned, the optical scattering rate at this detuning ($\approx$70 GHz) is acceptably low. For lower detuning ($<$30 GHz) a larger fraction was guided but radiation pressure starts to push the atoms upward, effectively lowering the acceleration due to gravity. The measured guided fraction agrees well with an analytical model.

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