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We present a 3D theoretical comparison between the radiation-pressure forcesexerted on an atom in an isotropic light cooling scheme and in a six-beammolasses. We demonstrate that, in the case of a background vapor where all thespace directions of the atomic motion have to be considered, the mean coolingrate is equal in both configurations. Nevertheless, we also point out whatmainly differentiates the two cooling techniques: the force componentorthogonal to the atomic motion. If this transverse force is always null in theisotropic light case, it can exceed the radiation-pressure-force longitudinalcomponent in the six-beam molasses configuration for high atomic velocities,hence reducing the velocity capture range.

Isotropic Light vs Six-Beam Molasses for Doppler Cooling of Atoms From Background Vapor - Theoretical Comparison