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arXiv:1610.02284 · Journal of Physics B Atomic Molecular and Optical Physics

Optical cooling and trapping of highly magnetic atoms: the benefits of a spontaneous spin polarization

Davide Dreon, Leonid A. Sidorenkov, Chayma Bouazza, W. Maineult, Jean Dalibard, Sylvain Nascimbène

Published Feb 2, 2017• 46 citations
arXivHTMLPDF

Abstract

Optical cooling and trapping of highly magnetic atoms: the benefits of a spontaneous spin polarization, Dreon, Davide, Sidorenkov, Leonid A, Bouazza, Chayma, Maineult, Wilfried, Dalibard, Jean, Nascimbene, Sylvain
DOI
10.1088/1361-6455/aa5db5

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We describe the setup to create a large Bose-Einstein condensate containing more than 120 x 10(6) atoms. In the experiment a thermal beam is slowed by a Zeeman slower and captured in a dark-spot magneto-optical trap (MOT). A typical dark-spot MOT in our experiments contains 2.0 x 10(10) atoms with a temperature of 320 microK and a density of about 1.0 x 10(11) atoms/cm(3). The sample is spin polarized in a high magnetic field before the atoms are loaded in the magnetic trap. Spin polarizing in a high magnetic field results in an increase in the transfer efficiency by a factor of 2 compared to experiments without spin polarizing. In the magnetic trap the cloud is cooled to degeneracy in 50 s by evaporative cooling. To suppress the three-body losses at the end of the evaporation, the magnetic trap is decompressed in the axial direction.