arXiv subjects

E. Arimondo

Publications and source records attributed to E. Arimondo.

57 records · Page 4Linked to original sources

arXiv2000

Bose-Einstein condensation of rubidium atoms in a triaxial TOP-trap

We report the results of experiments with Bose-Einstein condensates of rubidium atoms in a triaxial TOP-trap, presenting measurements of the condensate fraction and the free expansion of a condensate released from the trap. The experimental apparatus and the methods used to calibrate the magnetic trapping fields are discussed in detail. Furthermore, we compare the performance of our apparatus with other TOP-traps and discuss possible limiting factors for the sizes of condensates achievable in such traps.

cond-mat.soft↗

arXiv1998

Oscillation Frequencies for a Bose Condensate in a Triaxial Magnetic Trap

We investigate the dynamics of a Bose condensate, interacting with either repulsive or attractive forces, confined in a fully anisotropic harmonic potential. The (3+1)-dimensional Gross-Pitaevskii equation is integrated numerically to derive the collective excitation frequencies, showing a good agreement with those calculated with a variational technique.

cond-mat↗

arXiv1996

Coherent Population Trapping with Losses on the Sodium D1 Line Hanle Effect

We consider the coherent population trapping phenomenon in a thermal sodium atomic beam. We compare the different coherent population trapping schemes that can be established on the D1 line using the Zeeman sublevels of a given ground hyperfine state. The coherent population trapping preparation is examined by means of a Hanle effect configuration. The efficiency of the coherent population trapping phenomenon has been examined in presence of optical pumping into hyperfine levels external to those of the excited transition. We show that both the contrast and the width of the coherent population trapping resonance strongly decrease when the optical pumping rate is increased. In the experiment, the loss rate due to optical pumping has been controlled by means of a laser repump of variable intensity.

physics.atom-ph↗