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

Guillaume Salomon 1 Lauriane Fouché 1 Pengjun Wang 1 Alain Aspect 1 Philippe Bouyer 2 Thomas Bourdel 1 
1 Laboratoire Charles Fabry / Optique atomique
LCF - Laboratoire Charles Fabry
2 lp2n-02,lp2n-11
LP2N - Laboratoire Photonique, Numérique et Nanosciences
Abstract : 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.
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Submitted on : Friday, October 4, 2013 - 7:12:11 PM
Last modification on : Sunday, June 26, 2022 - 12:26:02 AM
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Guillaume Salomon, Lauriane Fouché, Pengjun Wang, Alain Aspect, Philippe Bouyer, et al.. Gray molasses cooling of $^{39}$K to a high phase-space density. EPL - Europhysics Letters, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2013, 104, pp.63002. ⟨10.1209/0295-5075/104/63002⟩. ⟨hal-00870074⟩



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