Abstract
We build up a novel setup of a two-dimensional (2D) 85Rb magneto-optical trap (MOT) with a high optical depth (OD) of 38. Such a MOT trap of 85Rb has several advantages as compared to the normal three-dimensional ellipsoidal MOT. Firstly, it will greatly enhance atom-photon interaction due to the large OD. Then, the dephasing caused by the magnetic gradient will be decreased in the long axis of the 2D MOT, which we want to avoid from in the experiments. The metastable ground level dephasing rate was γ21 = 0.008γ31, which is much less than that in a normal MOT. The total number of atoms in this MOT was measured to be 9.1 × 108.
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