Creation of a Bose-condensed gas of ⁸⁷Rb by laser cooling
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Author(s)
Hu, Jiazhong
Urvoy, Alban Joseph
Vendeiro, Zachary Michael
Crepel, Valentin Didier
Chen, Wenlan
Vuletic, Vladan
Date Issued
November 2017
Journal
Science
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Hu, Jiazhong et al. “Creation of a Bose-condensed gas of ⁸⁷Rb by laser cooling.” Science 358, 6366 (November 2017): 1078–1080 © The Author(s), some rights reserved; exclusive licensee American Association for the Advancement of Science (AAAS)
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Author's final manuscript
Abstract
Protocols for attaining quantum degeneracy in atomic gases almost exclusively rely on evaporative cooling, a time-consuming final step associated with substantial atom loss. We demonstrate direct laser cooling of a gas of rubidium-87 (⁸⁷Rb) atoms to quantum degeneracy. The method is fast and induces little atom loss. The atoms are trapped in a two-dimensional optical lattice that enables cycles of compression to increase the density, followed by Raman sideband cooling to decrease the temperature. From a starting number of 2000 atoms, 1400 atoms reach quantum degeneracy in 300 milliseconds, as confirmed by a bimodal velocity distribution. The method should be broadly applicable to many bosonic and fermionic species and to systems where evaporative cooling is not possible.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1126/science.aan5614
