Cold trapped atoms detected with evanescent waves

Details Cold trapped atoms detected with evanescent waves Cold trapped atoms detected with evanescent waves

2002-05-07

arxiv.org/abs/physics/0205014v2

Eur. Phys. J. D 21, 347-351 (2002)

Physics

Atomic Physics

5 pages, 3 figures

Scientific paper

10.1140/epjd/e2002-00205-1

We demonstrate the in situ detection of cold 87 Rb atoms near a dielectric surface using the absorption of a weak, resonant evanescent wave. We have used this technique in time of flight experiments determining the density of atoms falling on the surface. A quantitative understanding of the measured curve was obtained using a detailed calculation of the evanescent intensity distribution. We have also used it to detect atoms trapped near the surface in a standing-wave optical dipole potential. This trap was loaded by inelastic bouncing on a strong, repulsive evanescent potential. We estimate that we trap 1.5 x 10 4 atoms at a density 100 times higher than the falling atoms.

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