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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Cited by in corpus (20)

• Feshbach spectroscopy and dual-species Bose-Einstein condensation of ${}^{23}\mathrm{Na}-$${}^{39}\mathrm{K}$ mixtures
• Creating big time crystals with ultracold atoms
• Observation of interspecies Feshbach resonances in an ultracold ${}^{39}$K-${}^{133}$Cs mixture and refinement of interaction potentials
• Quantum test of the Universality of Free Fall using rubidium and potassium
• Observation of Weak Collapse in a Bose-Einstein Condensate
• Feshbach resonances and weakly bound molecular states of boson-boson and boson-fermion NaK pairs
• Sub-Doppler laser cooling of 40K with Raman gray molasses on the D2 line
• All-optical production and transport of a large ${}^6$Li quantum gas in a crossed optical dipole trap
• Degenerate Raman sideband cooling of 39K
• Generation of high-purity, low-temperature samples of ${}^{39}$K for applications in metrology
• All-Optical Matter-Wave Lens using Time-Averaged Potentials
• Quantitative analysis of losses close to a d-wave open-channel Feshbach resonance in Potassium 39
• Rapid production of large ${}^7$Li Bose-Einstein condensates using $D_1$ gray molasses
• Bidirectional, Analog Current Source Benchmarked with Gray Molasses-Assisted Stray Magnetic Field Compensation
• Loading of atoms into an optical trap with high initial phase-space density
• Rapid generation of all-optical ${}^{39}$K Bose-Einstein condensates using a low-field Feshbach resonance
• Bimodal momentum distribution of laser-cooled atoms in optical lattices
• Multi-frequency telecom fibered laser system for potassium laser cooling
• Observation of the algebraic localization-delocalization transition in a 1D disordered potential with a bias force
• Condensed matter physics in big discrete time crystals