Skip to Main content Skip to Navigation
Theses

STUDIES OF COLD CHROMIUM ATOMS IN MAGNETIC AND OPTICAL TRAPS: steps towards Bose-Einstein Condensation

Abstract : In the perspective of studying dipole-dipole interactions in quantum degenerate Bose and Fermi gases, we have built an experimental setup for cooling and trapping Chromium (Cr) atoms. In this respect, one needs to use appropriate technological solution, such as a high-temperature oven (∼ 1500◦C) and a laser system providing high laser power at 425nm. Our experiments allow us to obtain magneto-optical traps for the two main isotopes of Cr (i.e. the bosonic 52Cr and the fermionic 53Cr). These traps are characterized by large light-assisted collisional loss rates, which have been studied both experimentally and theoretically. The existence of radiative decay channels towards two long-lived metastable states allows the magnetic trapping and accumulation of fairly large atom numbers of cold Cr atoms. We have studied the possibility of modifying the shape of these traps with the use of RF magnetic fields, which allowed the study of collisional properties of Cr atoms in the metastable states. Finally, we have demonstrated a new continuous loading technique of an optical dipole trap with more than one million metastable 52Cr atoms, at 100μK. The transfer into the ground state and the polarization in the lowest-energy Zeeman sublevel opens the perspective for reaching the Bose-Einstein condensation of Cr through evaporative cooling.
Complete list of metadatas

Cited literature [89 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00288354
Contributor : Radu Chicireanu <>
Submitted on : Monday, June 16, 2008 - 3:20:35 PM
Last modification on : Saturday, February 15, 2020 - 2:04:58 AM
Long-term archiving on: : Tuesday, June 15, 2010 - 4:57:44 PM

Identifiers

  • HAL Id : tel-00288354, version 1

Collections

Citation

Radu Chicireanu. STUDIES OF COLD CHROMIUM ATOMS IN MAGNETIC AND OPTICAL TRAPS: steps towards Bose-Einstein Condensation. Atomic Physics [physics.atom-ph]. Université Paris-Nord - Paris XIII, 2007. English. ⟨tel-00288354⟩

Share

Metrics

Record views

399

Files downloads

670