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Quantum Electronics and Laser Science Conference

Magneto-optical trapping of Cr atoms

C.C. Bradley, Jabez J. McClelland, W.R. Anderson, R. J. Celotta

Published Jan 20, 2003• 0 citations
Publisher

Abstract

Summary form only given. We have constructed a magneto-optical trap for chromium atoms. The motivation for this work lies in the usefulness of chromium for atom-optically controlled deposition, and the fact that a magneto-optically trapped sample of atoms provides a high-brightness monochromatic source of atoms. Further motivation exists in the possible production of quantum-degenerate Bose and Fermi gases with different isotopes of Cr.

DOI
10.1109/qels.1999.807337

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Summary form only given. We have constructed a magneto-optical trap for chromium atoms. The motivation for this work lies in the usefulness of chromium for atom-optically controlled deposition, and the fact that a magneto-optically trapped sample of atoms provides a high-brightness monochromatic source of atoms. Further motivation exists in the possible production of quantum-degenerate Bose and Fermi gases with different isotopes of Cr.
Full text: The study of quantum gases made of chromium atoms is compelling for several reasons. Being accessible to laser manipulation, chromium has a most abundant bosonic isotope {sup 52}Cr and a 9-percent abundant fermionic isotope {sup 53}Cr. Most importantly, Cr atoms carry an exceptionally large magnetic moment of 6 {mu}{sub B}. Consequently, Cr provides a valuable tool to study the physics of dipolar quantum gases as demonstrated elsewhere. We present our recent achievement of a chromium Bose-Einstein Condensation (Cr-BEC) using an all-optical procedure along with two innovative techniques: continuous accumulation of metastable {sup 52}Cr atoms in a mixed optical and magnetic trap; fast and intense rf sweeps to average to zero the magnetic potential and optimize the transfer efficiency from the Cr-MOT to the optical trap. We also report on the rf spectroscopy and association of weakly bound Cr{sub 2} molecules in the decatriplet {sup 13}{sigma}{sub g}{sup +} state. These latter experiments are performed in the vicinity of a d-wave Feshbach resonance at low magnetic field. Though the association rate is at present fairly low, we can study the spectroscopic properties of these cold trapped high-spin chromium molecules. (author)
We report on magneto-optical trapping of fermionic 53Cr^{53}\mathrm{Cr}53Cr atoms. A Zeeman-slowed atomic beam provides loading rates up to $3\ifmmode\times\else\texttimes\fi{}{10}^{6}\phantom{\rule{0.3em}{0ex}}{\mathrm{s}}^{\ensuremath{-}1}$. We present systematic characterization of the magneto-optical trap (MOT). We obtain up to $5\ifmmode\times\else\texttimes\fi{}{10}^{5}$ atoms in the steady-state MOT. The atoms radiatively decay from the excited PPP state into metastable DDD states, and, due to the large dipolar magnetic moment of chromium atoms in these states, they can remain magnetically trapped in the quadrupole field gradient of the MOT. We study the accumulation of metastable 53Cr^{53}\mathrm{Cr}53Cr atoms in this magnetic trap. We also report on the simultaneous magneto-optical trapping of bosonic 52Cr^{52}\mathrm{Cr}52Cr and fermionic 53Cr^{53}\mathrm{Cr}53Cr atoms. Finally, we characterize the light-assisted collision losses in this Bose-Fermi cold mixture.