Production of large ${}^{41}$K Bose-Einstein condensates using D1 gray molasses

Abstract

We use D1 gray molasses to achieve Bose-Einstein condensation of a large number of ${}^{41}$K atoms in an optical dipole trap. By combining a new configuration of compressed-MOT with D1 gray molasses, we obtain a cold sample of $2.4\times 10^9$ atoms with a temperature as low as 42 $\mu$K. After magnetically transferring the atoms into the final glass cell, we perform a two-stage evaporative cooling. A condensate with up to $1.2\times 10^6$ atoms in the lowest Zeeman state $|F=1,m_F=1⟩$ is achieved in the optical dipole trap. Furthermore, we observe two narrow Feshbach resonances in the lowest hyperfine channel, which are in good agreement with theoretical predictions.

arXiv comment6 pages, 5 figures

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• A quantum degenerate Bose-Fermi mixture of ${}^{41}$K and ${}^6$Li
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• Feshbach spectroscopy of an ultracold ${}^{41}$K-${}^6$Li mixture and ${}^{41}$K atoms
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• Observation of state-to-state hyperfine-changing collision in a Bose-Fermi mixture of ${}^6$Li and ${}^{41}$K atoms
• Cooling All External Degrees of Freedom of Optically Trapped Chromium Atoms Using Gray Molasses
• Multi-frequency telecom fibered laser system for potassium laser cooling
• Sub-Doppler laser cooling and magnetic trapping of natural-abundance fermionic potassium
• $\Lambda$-Enhanced Gray Molasses Cooling of ${}^{85}$Rb Atoms in Tweezers Using the D${}_2$ Line