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Magneto-Optic Trapping of Chromium Atoms

C. C. Bradley, W. R. Anderson, Jabez J. McClelland +1 more

APSMay 1, 19980 citations

Magneto-Optical Trapping of Chromium Atoms | NIST

C. C. Bradley, Jabez J. McClelland, W. R. Anderson +1 more

Physical Review AMay 1, 20000 citations

Accumulation of chromium metastable atoms into an Optical Trap

Quentin Beaufils, Radu Chicireanu, O. Gorceix +5 more

We report the fast accumulation of a large number of metastable 52Cr atoms in a mixed trap, formed by the superposition of a strongly confining optical trap and a quadrupolar magnetic trap. The steady state is reached after about 400 ms, providing a cloud of more than one million metastable atoms at a temperature of about 100 microK, with a peak density of 10^{18} atoms.m^{-3}. We have optimized the loading procedure, and measured the light shift of the 5D4 state by analyzing how the trapped atoms respond to a parametric excitation. We compare this result to a theoretical evaluation based on the available spectroscopic data for chromium atoms.We report the fast accumulation of a large number of metastable 52Cr atoms in a mixed trap, formed by the superposition of a strongly confining optical trap and a quadrupolar magnetic trap. The steady state is reached after about 400 ms, providing a cloud of more than one million metastable atoms at a temperature of about 100 microK, with a peak density of 10^{18} atoms.m^{-3}. We have optimized the loading procedure, and measured the light shift of the 5D4 state by analyzing how the trapped atoms respond to a parametric excitation. We compare this result to a theoretical evaluation based on the available spectroscopic data for chromium atoms.

Aug 1, 20070 citations

Averaging out magnetic forces with fast rf sweeps in an optical trap for metastable chromium atoms

Quentin Beaufils, Radu Chicireanu, A. Pouderous +6 more

We introduce a time-averaged trap in which the internal state of the atoms is rapidly modulated to modify the magnetic trapping potential. In our experiment, fast radio-frequency linear sweeps flip the spins of atoms at a fast rate, which averages out the magnetic forces. We use this procedure to optimize the accumulation of metastable chromium atoms in an optical dipole trap from a magneto-optical trap. The potential experienced by the metastable atoms is identical to the bare optical dipole potential, so that this procedure allows for trapping all magnetic sublevels, hence increasing by up to 80% the final number of accumulated atoms.We introduce a time-averaged trap in which the internal state of the atoms is rapidly modulated to modify the magnetic trapping potential. In our experiment, fast radio-frequency linear sweeps flip the spins of atoms at a fast rate, which averages out the magnetic forces. We use this procedure to optimize the accumulation of metastable chromium atoms in an optical dipole trap from a magneto-optical trap. The potential experienced by the metastable atoms is identical to the bare optical dipole potential, so that this procedure allows for trapping all magnetic sublevels, hence increasing by up to 80% the final number of accumulated atoms.

arXiv:0711.0663Physical Review AMay 29, 20087 citations

Trapping metastable neon atoms

J. G. C. Tempelaars

Jan 1, 20010 citations

An optical trap for Chromium atoms

Radu Chicireanu, Quentin Beaufils, A. Pouderous +5 more

Our recent experiments demonstrate the continuous accumulation and thermalisation of up to 5ldr10752Cr atoms in a finite-depth magnetic quadrupole trap. Chromium possesses metastable dark states, in which atoms can be accumulated and which are shielded from the light-assisted inelastic collisions, activated by the MOT.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)Jun 1, 20070 citations

Accumulation of chromium metastable atoms into an optical trap

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Accumulation of chromium metastable atoms into an optical trap

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