Optimized loading of an optical dipole trap for the production of chromium BECs

Year: 2011

Authors: Bismut G., Pasquiou B., Ciampini D., Laburthe-Tolra B., Maréchal E., Vernac L., Gorceix O.

Autors Affiliation: Laboratoire de Physique des Lasers, Institut Galilée, Université Paris 13, 99 Ave J.B. Clément, 93430 Villetaneuse, France; CNRS, UMR 7538, 99 Ave J.B. Clément, 93430 Villetaneuse, France; CNISM UdR Pisa, Dipartimento di Fisica E. Fermi, Universita di Pisa, Largo Pontecorvo 3, Pisa 56127, Italy

Abstract: We report on a strategy to maximize the number of chromium atoms transferred from a magneto-optical trap into an optical trap through accumulation in metastable states via strong optical pumping. We analyse how the number of atoms in a chromium Bose-Einstein condensate can be raised by a proper handling of the metastable state populations. Four laser diodes have been implemented to address the four levels that are populated during the MOT phase. The individual importance of each state is specified. To stabilize two of our laser diode, we have developed a simple ultrastable passive reference cavity whose long term stability is better than 1 MHz.

Journal/Review: APPLIED PHYSICS B-LASERS AND OPTICS

Volume: 102 (1)      Pages from: 1  to: 9

More Information: LPL is Unite Mixte (UMR 7538) of CNRS and of Universite Paris Nord. This research has been supported by Ministere de l\’Enseignement Superieur et de la Recherche (CPER) and by IFRAF (Institut Francilien de Recherche sur les Atomes Froids). G. Bismut acknowledges financial support by IFRAF. We thank the members of the HOTES group from LPL for giving us the ULE rod that we used to build the ultrastable cavity.
KeyWords: Bose-Einstein condensates; Optical dipole traps; Magneto-optical trap; Chromium; Laser diodes
DOI: 10.1007/s00340-010-4171-y

Citations: 9
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