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.

References in corpus (14)

• Many-Body Physics with Ultracold Gases
• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Bose-Einstein Condensation of Erbium
• Collective excitations of a degenerate gas at the BEC-BCS crossover
• Observation of an Efimov spectrum in an atomic system
• 39-K Bose-Einstein condensate with tunable interactions
• All-Optical Production of Chromium Bose-Einstein Condensates
• Feshbach resonances in ultracold K(39)
• Bose-Einstein condensation of alkaline earth atoms: ${}^{40}${Ca}
• Quasi-1D Bose-Einstein condensates in the dimensional crossover regime
• Virial theorems for trapped cold atoms
• Collective Modes in a Unitary Fermi Gas across the Superfluid Phase Transition
• Efficient Production of Large 39K Bose-Einstein Condensates
• All-optical generation and photoassociative probing of sodium Bose-Einstein condensates

Cited by in corpus (5)

• Observation of interspecies Feshbach resonances in an ultracold ${}^{39}$K-${}^{133}$Cs mixture and refinement of interaction potentials
• Observation of Weak Collapse in a Bose-Einstein Condensate
• Degenerate Raman sideband cooling of 39K
• Generation of high-purity, low-temperature samples of ${}^{39}$K for applications in metrology
• Rapid production of large ${}^7$Li Bose-Einstein condensates using $D_1$ gray molasses