dorsal/arxiv
View SchemaSpin-Polarizing Cold Sodium Atoms in a Strong Magnetic Field
| Authors | K. M. R. van der Stam, A. Kuijk, R. Meppelink, J. M. Vogels, P. van der Straten |
|---|---|
| Categories | |
| ArXiv ID | physics/0603255 |
| URL | https://arxiv.org/abs/physics/0603255 |
| DOI | 10.1103/PhysRevA.73.063412 |
Abstract
The efficiency of evaporative cooling, which is used for the creation of a Bose Einstein condensate, depends strongly on the number of particles at the start of the evaporation. A high efficiency can be reached by filling the magneto-optical trap with a large number of atoms and subsequently transferring these atoms to the magnetic trap as efficiently as possible. In our case (for sodium) this efficiency is limited to 1/3, because the magnetic substates of the F = 1 state, which is used in the trapping process, are equally populated. This limit can be overcome by spin-polarizing the sample before the transfer. For sodium atoms, however, the improvement is very small when it is done in a small magnetic field due to the large number of optical transitions in combination with the high optical density. In this article we describe spin-polarizing sodium atoms in a high magnetic field. The transfer efficiency is increased by a factor of 2. The high magnetic field makes the process also more robust against variations in the magnetic field, the laser frequency and the polarization of the laser beam.
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"abstract": "The efficiency of evaporative cooling, which is used for the creation of a\nBose Einstein condensate, depends strongly on the number of particles at the\nstart of the evaporation. A high efficiency can be reached by filling the\nmagneto-optical trap with a large number of atoms and subsequently transferring\nthese atoms to the magnetic trap as efficiently as possible. In our case (for\nsodium) this efficiency is limited to 1/3, because the magnetic substates of\nthe F = 1 state, which is used in the trapping process, are equally populated.\nThis limit can be overcome by spin-polarizing the sample before the transfer.\nFor sodium atoms, however, the improvement is very small when it is done in a\nsmall magnetic field due to the large number of optical transitions in\ncombination with the high optical density. In this article we describe\nspin-polarizing sodium atoms in a high magnetic field. The transfer efficiency\nis increased by a factor of 2. The high magnetic field makes the process also\nmore robust against variations in the magnetic field, the laser frequency and\nthe polarization of the laser beam.",
"arxiv_id": "physics/0603255",
"authors": [
"K. M. R. van der Stam",
"A. Kuijk",
"R. Meppelink",
"J. M. Vogels",
"P. van der Straten"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1103/PhysRevA.73.063412",
"title": "Spin-Polarizing Cold Sodium Atoms in a Strong Magnetic Field",
"url": "https://arxiv.org/abs/physics/0603255"
},
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