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Λ-enhanced grey molasses on the D(2) transition of Rubidium-87 atoms

Laser cooling based on dark states, i.e. states decoupled from light, has proven to be effective to increase the phase-space density of cold trapped atoms. Dark-states cooling requires open atomic transitions, in contrast to the ordinary laser cooling used for example in magneto-optical traps (MOTs)...

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Autores principales: Rosi, Sara, Burchianti, Alessia, Conclave, Stefano, Naik, Devang S., Roati, Giacomo, Fort, Chiara, Minardi, Francesco
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5778025/
https://www.ncbi.nlm.nih.gov/pubmed/29358635
http://dx.doi.org/10.1038/s41598-018-19814-z
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author Rosi, Sara
Burchianti, Alessia
Conclave, Stefano
Naik, Devang S.
Roati, Giacomo
Fort, Chiara
Minardi, Francesco
author_facet Rosi, Sara
Burchianti, Alessia
Conclave, Stefano
Naik, Devang S.
Roati, Giacomo
Fort, Chiara
Minardi, Francesco
author_sort Rosi, Sara
collection PubMed
description Laser cooling based on dark states, i.e. states decoupled from light, has proven to be effective to increase the phase-space density of cold trapped atoms. Dark-states cooling requires open atomic transitions, in contrast to the ordinary laser cooling used for example in magneto-optical traps (MOTs), which operate on closed atomic transitions. For alkali atoms, dark-states cooling is therefore commonly operated on the D(1) transition nS(1/2) → nP(1/2). We show that, for (87)Rb, thanks to the large hyperfine structure separations the use of this transition is not strictly necessary and that “quasi-dark state” cooling is efficient also on the D(2) line, 5S(1/2) → 5P(3/2). We report temperatures as low as (4.0 ± 0.3) μK and an increase of almost an order of magnitude in the phase space density with respect to ordinary laser sub-Doppler cooling.
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spelling pubmed-57780252018-01-31 Λ-enhanced grey molasses on the D(2) transition of Rubidium-87 atoms Rosi, Sara Burchianti, Alessia Conclave, Stefano Naik, Devang S. Roati, Giacomo Fort, Chiara Minardi, Francesco Sci Rep Article Laser cooling based on dark states, i.e. states decoupled from light, has proven to be effective to increase the phase-space density of cold trapped atoms. Dark-states cooling requires open atomic transitions, in contrast to the ordinary laser cooling used for example in magneto-optical traps (MOTs), which operate on closed atomic transitions. For alkali atoms, dark-states cooling is therefore commonly operated on the D(1) transition nS(1/2) → nP(1/2). We show that, for (87)Rb, thanks to the large hyperfine structure separations the use of this transition is not strictly necessary and that “quasi-dark state” cooling is efficient also on the D(2) line, 5S(1/2) → 5P(3/2). We report temperatures as low as (4.0 ± 0.3) μK and an increase of almost an order of magnitude in the phase space density with respect to ordinary laser sub-Doppler cooling. Nature Publishing Group UK 2018-01-22 /pmc/articles/PMC5778025/ /pubmed/29358635 http://dx.doi.org/10.1038/s41598-018-19814-z Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Rosi, Sara
Burchianti, Alessia
Conclave, Stefano
Naik, Devang S.
Roati, Giacomo
Fort, Chiara
Minardi, Francesco
Λ-enhanced grey molasses on the D(2) transition of Rubidium-87 atoms
title Λ-enhanced grey molasses on the D(2) transition of Rubidium-87 atoms
title_full Λ-enhanced grey molasses on the D(2) transition of Rubidium-87 atoms
title_fullStr Λ-enhanced grey molasses on the D(2) transition of Rubidium-87 atoms
title_full_unstemmed Λ-enhanced grey molasses on the D(2) transition of Rubidium-87 atoms
title_short Λ-enhanced grey molasses on the D(2) transition of Rubidium-87 atoms
title_sort λ-enhanced grey molasses on the d(2) transition of rubidium-87 atoms
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5778025/
https://www.ncbi.nlm.nih.gov/pubmed/29358635
http://dx.doi.org/10.1038/s41598-018-19814-z
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