{"id":556,"date":"2007-06-27T13:31:00","date_gmt":"2007-06-27T11:31:00","guid":{"rendered":"https:\/\/gqm.lpl.univ-paris13.fr\/?p=556"},"modified":"2025-10-28T15:26:26","modified_gmt":"2025-10-28T14:26:26","slug":"cooling-and-trapping-chromium-atoms","status":"publish","type":"post","link":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2007\/06\/27\/cooling-and-trapping-chromium-atoms\/","title":{"rendered":"Cooling and trapping chromium atoms"},"content":{"rendered":"\n
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Abstract:<\/strong><\/h4>\n\n\n\n

This work comes within the scope of obtaining dipolar quantum gases : a Bose-Einstein condensate of 52<\/sup>Cr and a Fermi sea of 53<\/sup>Cr. The large magnetic moment of 6 \u00b5B in the ground state, the electronic structure in lambda-shape and the presence of a fermionic isotope made chromium attractive for experiments in the field of ultracold atoms.<\/p>\n\n\n\n

The experimental setup constructed looks like a trapping experiment on a usual element. Nevertheless, specific technical solutions to operate a high-temperature oven or to generate a blue laser beam at 425.5 nm which is not modulated were chosen. Moreover, two projects which I have carried out are detailed : the temperature lock of a Fabry Perot cavity and the absorption optics system. The magneto-optical traps of 52<\/sup>Cr and 53<\/sup>Cr obtained contain respectively 4×106<\/sup> and 5×105<\/sup> atoms for densities of 8×1010<\/sup> and 2.5×1010<\/sup> cm-3<\/sup>. These two traps have similar characteristics : a high inelastic two-body collision rate in the range of 5×10-9<\/sup> cm-3<\/sup>.s-1<\/sup> and a one-body loss rate of 169 s-1<\/sup> for the 52<\/sup>Cr and of 280 s-1<\/sup> for the 53<\/sup>Cr explained by a decay towards metastable states. This latest property enables to accumulate continuously 2×107<\/sup> atoms of 52<\/sup>Cr and 8×105<\/sup> atoms of 53<\/sup>Cr in the quadrupolar trap formed by the coils of the magneto-optical trap. The first achievement and characterization of a simultaneous magneto-optical trap of a mixture 52<\/sup>Cr-53<\/sup>Cr is also shown.<\/p>\n\n\n\n

The accumulation of bosonic metastable atoms in an optical trap superimposed to a linear magnetic trap is studied. This original trap enables to achieve the first optical trap of atoms in metastable states. In a very short time of 100 ms, the optical trap contains 1.2×106<\/sup> metastable atoms with a density of 1011<\/sup> cm-3<\/sup>. This result constitutes a fist step towards the realization of a crossed optical trap where atoms will be polarized and then cooled below the condensation threshold.<\/p>\n\n\n\n

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2007 – Thesis – Arnaud Pouderous<\/a>Download<\/a><\/div>\n<\/div>\n\n\n\n
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Link to HAL<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n

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Soutenance de th\u00e8se de Arnaud Pouderous<\/em>
Date:<\/strong> Mardi 25 juin 2007
Location:<\/strong> Laboratoire de Physique des Lasers, 99 av. J.B. Cl\u00e9ment 93430 Villetaneuse France<\/p>\n\n\n\n

Keywords:<\/strong><\/h4>\n\n\n\n

Laser cooling, magneto-optical trap, magnetic trap, optical trap, chromium, cold collisions.<\/p>\n\n\n\n

Jury:<\/strong><\/h4>\n\n\n\n
    \n
  • Jean-Fran\u00e7ois Roch (President)<\/li>\n\n\n\n
  • Thomas Coudreau (Referee)<\/li>\n\n\n\n
  • Laurence Pruvost (Referee)<\/li>\n\n\n\n
  • Arnaud Landragin (Examiner)<\/li>\n\n\n\n
  • Anne Amy-Klein (Examiner)<\/li>\n\n\n\n
  • Olivier Gorceix (Supervisor)<\/li>\n<\/ul>\n<\/div>\n<\/div><\/div>\n\n\n\n

    French version:<\/h4>\n\n\n\n

    Refroidissement et pi\u00e9geage d’atomes de chrome<\/h3>\n\n\n\n

    Ce travail s\u2019inscrit dans la perspective d\u2019obtenir des gaz quantiques dipolaires : condensat de Bose-Einstein du 52<\/sup>Cr et mer de Fermi d\u00e9g\u00e9n\u00e9r\u00e9e du 53<\/sup>Cr. Le fort moment magn\u00e9tique de 6 \u00b5B dans l\u2019\u00e9tat fondamental, la structure \u00e9lectronique en lambda et la pr\u00e9sence d\u2019un isotope fermionique rendent en effet l\u2019atome de chrome attractif pour des exp\u00e9riences d\u2019atomes froids. Le dispositif exp\u00e9rimental mis en place ressemble \u00e0 une exp\u00e9rience de pi\u00e9geage sur un atome usuel. N\u00e9anmoins, des solutions technologiques sp\u00e9cifiques pour r\u00e9aliser un four \u00e0 haute temp\u00e9rature ou g\u00e9n\u00e9rer un faisceau laser \u00e0 425,5 nm non modul\u00e9 ont \u00e9t\u00e9 adopt\u00e9es. De plus, deux projets que j\u2019ai men\u00e9s \u00e0 bien sont d\u00e9taill\u00e9s : l\u2019asservissement en temp\u00e9rature d\u2019une cavit\u00e9 Fabry Perot et le syst\u00e8me d\u2019imagerie par absorption.<\/p>\n\n\n\n

    Les pi\u00e8ges magn\u00e9to-optiques de 52<\/sup>Cr et de 53<\/sup>Cr obtenus contiennent respectivement 4.106<\/sup> et 5.105<\/sup> atomes pour des densit\u00e9s de 8.1010<\/sup> et 2,5.1010<\/sup> cm-3<\/sup>. Ces deux pi\u00e8ges pr\u00e9sentent des caract\u00e9ristiques similaires : un fort taux de collisions \u00e0 deux corps de l\u2019ordre de 5.10-9<\/sup> cm-3<\/sup>.s-1<\/sup> et un taux de pertes \u00e0 un corps de 169 s-1<\/sup> pour le 52<\/sup>Cr et de 280 s-1<\/sup> pour le 53<\/sup>Cr d\u00fb \u00e0 une desexcitation vers des \u00e9tats m\u00e9tastables. Cette derni\u00e8re propri\u00e9t\u00e9 permet d\u2019accumuler en continu 2.107<\/sup> atomes de 52<\/sup>Cr et 8.105<\/sup> atomes de 53<\/sup>Cr dans un pi\u00e8ge quadripolaire form\u00e9 par les bobines du pi\u00e8ge magn\u00e9to-optique. La premi\u00e8re obtention et caract\u00e9risation d\u2019un pi\u00e8ge magn\u00e9to-optique mixte d\u2019un m\u00e9lange 52<\/sup>Cr-53<\/sup>Cr est aussi expos\u00e9e.<\/p>\n\n\n\n

    L\u2019accumulation d\u2019atomes bosoniques m\u00e9tastables dans un pi\u00e8ge optique superpos\u00e9 \u00e0 un pi\u00e8ge magn\u00e9tique lin\u00e9aire est \u00e9tudi\u00e9e. Ce pi\u00e8ge original permet de r\u00e9aliser le premier pi\u00e8ge optique d\u2019atomes dans des \u00e9tats m\u00e9tastables. En un temps tr\u00e8s rapide de 100 ms, le pi\u00e8ge optique contient 2.106<\/sup> atomes m\u00e9tastables avec une densit\u00e9 de 1011<\/sup> cm-3<\/sup>. Ce r\u00e9sultat constitue une premi\u00e8re \u00e9tape vers l\u2019obtention d\u2019un pi\u00e8ge optique crois\u00e9 o\u00f9 les atomes seront polaris\u00e9s puis refroidis sous le seuil de condensation.<\/p>\n","protected":false},"excerpt":{"rendered":"

    French version: Refroidissement et pi\u00e9geage d’atomes de chrome Ce travail s\u2019inscrit dans la perspective d\u2019obtenir des gaz quantiques dipolaires : condensat de Bose-Einstein du 52Cr et mer de Fermi d\u00e9g\u00e9n\u00e9r\u00e9e du 53Cr. Le fort moment magn\u00e9tique de 6 \u00b5B dans l\u2019\u00e9tat fondamental, la structure \u00e9lectronique en lambda et la pr\u00e9sence d\u2019un isotope fermionique rendent en […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[75],"tags":[147],"class_list":["post-556","post","type-post","status-publish","format-standard","hentry","category-phd-thesis","tag-arnaud-pouderous"],"blocksy_meta":[],"yoast_head":"\nCooling and trapping chromium atoms - Magnetic Quantum Gases<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2007\/06\/27\/cooling-and-trapping-chromium-atoms\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cooling and trapping chromium atoms - Magnetic Quantum Gases\" \/>\n<meta property=\"og:description\" content=\"French version: Refroidissement et pi\u00e9geage d’atomes de chrome Ce travail s\u2019inscrit dans la perspective d\u2019obtenir des gaz quantiques dipolaires : condensat de Bose-Einstein du 52Cr et mer de Fermi d\u00e9g\u00e9n\u00e9r\u00e9e du 53Cr. 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