We report on the production of $^{52}\mathrm{Cr}$ Bose-Einstein condensates with an all-optical method. We first load $5\ifmmode\times\else\texttimes\fi{}{10}^{6}$ metastable chromium atoms in a one-dimensional (1D) far-off-resonance optical trap (FORT) from a magneto-optical trap, by combining the use of radio-frequency sweeps and depumping toward the $^{5}S_{2}$ state. The atoms are then pumped to the absolute ground state, and transferred into a crossed FORT in which they are evaporated. The fast loading of the 1D FORT ( $35\phantom{\rule{0.3em}{0ex}}\mathrm{ms}$ $1∕e$ time) and the use of relatively fast evaporative ramps allow us to obtain in $20\phantom{\rule{0.3em}{0ex}}\mathrm{s}$ about $15\phantom{\rule{0.2em}{0ex}}000$ atoms in an almost pure condensate.We report on the production of $^{52}\mathrm{Cr}$ Bose-Einstein condensates with an all-optical method. We first load $5\ifmmode\times\else\texttimes\fi{}{10}^{6}$ metastable chromium atoms in a one-dimensional (1D) far-off-resonance optical trap (FORT) from a magneto-optical trap, by combining the use of radio-frequency sweeps and depumping toward the $^{5}S_{2}$ state. The atoms are then pumped to the absolute ground state, and transferred into a crossed FORT in which they are evaporated. The fast loading of the 1D FORT ($35\phantom{\rule{0.3em}{0ex}}\mathrm{ms}$ $1∕e$ time) and the use of relatively fast evaporative ramps allow us to obtain in $20\phantom{\rule{0.3em}{0ex}}\mathrm{s}$ about $15\phantom{\rule{0.2em}{0ex}}000$ atoms in an almost pure condensate.

arXiv:0712.3521Physical Review AJun 2, 2008214 citations

Observation of Bose-Einstein condensation in a gas of chromium atoms

Axel Griesmaier, J. Stühler, Tilman Pfau

We have observed Bose-Einstein condensation of chromium atoms [1], whose large magnetic dipole moment is unique among all species that have been Bose-condensed so far. The arising magnetic forces are of anisotropic and long-range character and therefore introduce a novel type of interaction in the physics of ultracold quantum gases. In addition, it is expected that the character of the interaction present in a chromium BEC can be varied from mainly contact to purely dipolar utilizing one of the recently observed Feshbach resonances in 52Cr-collisions.We have observed Bose-Einstein condensation of chromium atoms [1], whose large magnetic dipole moment is unique among all species that have been Bose-condensed so far. The arising magnetic forces are of anisotropic and long-range character and therefore introduce a novel type of interaction in the physics of ultracold quantum gases. In addition, it is expected that the character of the interaction present in a chromium BEC can be varied from mainly contact to purely dipolar utilizing one of the recently observed Feshbach resonances in 52Cr-collisions.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIEApr 7, 20060 citations

Bose–Einstein Condensate

Galina A. Nemova

SPIE eBooksNov 6, 20190 citations

We report on the production of

^{52}\mathrm{Cr}

Bose-Einstein condensates with an all-optical method. We first load $5\ifmmode\times\else\texttimes\fi{}{10}^{6}$ metastable chromium atoms in a one-dimensional (1D) far-off-resonance optical trap (FORT) from a magneto-optical trap, by combining the use of radio-frequency sweeps and depumping toward the

^{5}S_{2}

state. The atoms are then pumped to the absolute ground state, and transferred into a crossed FORT in which they are evaporated. The fast loading of the 1D FORT (

35\phantom{\rule{0.3em}{0ex}}\mathrm{ms}

1∕e

time) and the use of relatively fast evaporative ramps allow us to obtain in

20\phantom{\rule{0.3em}{0ex}}\mathrm{s}

about

15\phantom{\rule{0.2em}{0ex}}000

atoms in an almost pure condensate.