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All optical cooling of $^{39}$K to Bose Einstein condensation

Abstract : We report the all-optical production of Bose Einstein condensates (BEC) of $^{39}$K atoms. We directly load $3 \times 10^{7}$ atoms in a large volume optical dipole trap from gray molasses on the D1 transition. We then apply a small magnetic quadrupole field to polarize the sample before transferring the atoms in a tightly confining optical trap. Evaporative cooling is finally performed close to a Feshbach resonance to enhance the scattering length. Our setup allows to cross the BEC threshold with $3 \times 10^5$ atoms every 7s. As an illustration of the interest of the tunability of the interactions we study the expansion of Bose-Einstein condensates in the 1D to 3D crossover.
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Contributor : Thomas Bourdel Connect in order to contact the contributor
Submitted on : Saturday, July 19, 2014 - 10:06:32 PM
Last modification on : Saturday, June 25, 2022 - 7:26:30 PM
Long-term archiving on: : Monday, November 24, 2014 - 8:42:48 PM


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G. Salomon, L. Fouché, S. Lepoutre, Alain Aspect, Thomas Bourdel. All optical cooling of $^{39}$K to Bose Einstein condensation. Physical Review A, American Physical Society, 2014, 90 (3), pp.033405. ⟨10.1103/PhysRevA.90.033405⟩. ⟨hal-01026128⟩



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