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Frontiers in Optics

Multi-photon Laser Cooling

J. V. Porto, Saijun Wu, Roger C. Brown, William D. Phillips

Published Jan 1, 2010• 0 citations
Publisher

Abstract

We explore laser cooling using light scattering between electronically excited atomic states. In a MOT with the laser beams along z replaced with beams coupling two excited states, we demonstrate efficient 3D cooling and trapping.
DOI
10.1364/fio.2010.stud3

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A two-color magneto-optical trap (MOT) for trapping cesium (Cs) atoms is experimentally realized. This two-color MOT employs the radiation forces due to photon scattering from the Cs 6P(3/2) F' = 5 - 8S(1/2) F" = 4 excited-state transition, which replaced one pair of the three pairs of cooling/trapping laser beams operating on a single-photon red detuning to the Cs 6S(1/2) F = 4 - 6P(3/2) F' = 5 cycling transition in a standard six-beam Cs MOT, and can cool and trap atoms on both the red-detuning and blue-detuning sides of the two-photon resonance. Employing the two-color MOT, the background-free fluorescence detection of trapped atoms has been demonstrated. This technique will be useful for observation of weak fluorescence signal radiated from single atoms in MOT.