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Article Dans Une Revue Applied Physics B - Laser and Optics Année : 1995

Three-dimensional spatial diffusion in optical molasses

Résumé

We have studied the expansion of a small cloud of85Rb atoms in three-dimensional optical molasses (lin ⊥ lin and σ+ − σ− configurations) and observed diffusive motion. We determined the spatial-diffusion coefficients for various laser intensities and detunings, and compared them (in the case of lin ⊥ lin molasses) to values calculated from friction and momentum-diffusion coefficients of a one-dimensional (1D) theory of laser cooling. The predicted variations of the spatial-diffusion coefficient with laser intensity and detuning are in good qualitative agreement with the experimental data. We found that the minimal value observed experimentally, ≈ 6 × 10−4 cm2/s, lies within a factor of 3 of the 1D theoretical minimum, ≈, 26ħ/M, whereM is the atomic mass.

Dates et versions

hal-03740682 , version 1 (29-07-2022)

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T. W. Hodapp, C. Gerz, C. Furtlehner, C. I. Westbrook, W. D. Phillips, et al.. Three-dimensional spatial diffusion in optical molasses. Applied Physics B - Laser and Optics, 1995, 60 (2), pp.135--143. ⟨10.1007/BF01135855⟩. ⟨hal-03740682⟩
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