SALOMON, Guillaume; FOUCHÉ, Lauriane; WANG, Pengjun; ASPECT, Alain; BOUYER, Philippe; BOURDEL, Thomas

doi:10.1209/0295-5075/104/63002

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SALOMON, Guillaume
Laboratoire Charles Fabry / Optique atomique

FOUCHÉ, Lauriane
Laboratoire Charles Fabry / Optique atomique

WANG, Pengjun
Laboratoire Charles Fabry / Optique atomique

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EPL - Europhysics Letters. 2013, vol. 104, p. 63002

European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing

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We present new techniques in cooling $^{39}$K atoms using laser light close to the D1 transition. First, a new compressed-MOT configuration is taking advantage of gray molasses type cooling induced by blue-detuned D1 light. It yields an optimized density of atoms. Then, we use pure D1 gray molasses to further cool the atoms to an ultra-low temperature of 6\,$\mu$K. The resulting phase-space density is $2\times 10^{-4}$ and will ease future experiments with ultracold potassium. As an example, we use it to directly load up to $3\times 10^7$ atoms in a far detuned optical trap, a result that opens the way to the all-optical production of potassium degenerate gases.< Leer menos

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Gray molasses cooling of $^{39}$K to a high phase-space density

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