Raman cooling of atoms below the gravitational limit

Details Raman cooling of atoms below the gravitational limit Raman cooling of atoms below the gravitational limit

1998-04-30

arxiv.org/abs/physics/9804034v3

Phys. Rev. A. V.58. No 5. pp. 3963-3973 (1998)

Physics

Atomic Physics

Final version accepted for publication in Phys. Rev. A. There are the following changes in the revised manuscript: 1. Explicit

Scientific paper

10.1103/PhysRevC.58.R5

Raman cooling of non-zero-spin atoms in the presence of gravitational and external magnetic fields is investigated. The magnetic field is adjusted so as to compensate for the gravitational force acting on ground-state atoms. The dark state (DS) is created and supported in momentum space with additional velocity-selective two-photon transitions. The minimum allowed temperature is found to be determined only by the width of velocity selection and therefore can be much less than the gravitational limit. A complete set of analytical formulas describing cooling of a dilute atomic sample is derived. They serve as the basis for numerical simulations which are carried out in the one-dimensional (1D) case.

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