All optical cooling of $^{39}$K to Bose Einstein condensation
Atomic Physics
2015-06-22 v1 Quantum Gases
Abstract
We report the all-optical production of Bose Einstein condensates (BEC) of K atoms. We directly load 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 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.
Keywords
Cite
@article{arxiv.1407.5317,
title = {All optical cooling of $^{39}$K to Bose Einstein condensation},
author = {Guillaume Salomon and Lauriane Fouché and Steven Lepoutre and Alain Aspect and Thomas Bourdel},
journal= {arXiv preprint arXiv:1407.5317},
year = {2015}
}