Sub-Doppler laser cooling of 40K with Raman gray molasses on the D2 line

Abstract

Gray molasses is a powerful tool for sub-Doppler laser cooling of atoms to low temperatures. For alkaline atoms, this technique is commonly implemented with cooling lasers which are blue-detuned from either the D1 or D2 line. Here we show that efficient gray molasses can be implemented on the D2 line of 40K with red-detuned lasers. We obtained temperatures of 48(2) microKelvin, which enables direct loading of 9.2(3)*10^6 atoms from a magneto-optical trap into an optical dipole trap. We support our findings by a one-dimensional model and three-dimensional numerical simulations of the optical Bloch equations which qualitatively reproduce the experimentally observed cooling effects.

arXiv comment6 pages, 5 figures

References in corpus (15)

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• Gray molasses cooling of ${}^{39}$K to a high phase-space density
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• Quantum interference-enhanced deep sub-Doppler cooling of 39 K atoms in gray molasses
• Simultaneous sub-Doppler laser cooling of fermionic ${}^6$Li and ${}^{40}$K on the D${}_1$ line: Theory and Experiment
• All optical cooling of ${}^{39}$K to Bose Einstein condensation
• Sub-Doppler Laser Cooling of Fermionic K-40 Atoms
• Two-stage magneto-optical trapping and narrow-line cooling of ${}^6$Li atoms to high phase-space density
• Sisyphus Cooling of Lithium

Cited by in corpus (11)

• Grey-molasses optical-tweezer loading: Controlling collisions for scaling atom-array assembly
• $\Lambda$-enhanced grey molasses on the $D_2$ transition of Rubidium-87 atoms
• Raman Gray Molasses Cooling of Cesium Atoms on the D2 Line
• Narrow-line cooling of ${}^{87}$Rb using 5S${}_{1/2}\to$ 6P${}_{3/2}$ open transition at 420 nm
• Sub-Doppler laser cooling of 23Na in gray molasses on the D2 line
• Comparison of an efficient implementation of gray molasses to narrow-line cooling for the all-optical production of a lithium quantum gas
• $\Lambda$-enhanced gray molasses in a tetrahedral laser beam geometry
• Microwave preparation of two-dimensional fermionic spin mixtures
• Spinor matterwave control with nanosecond spin-dependent kicks
• 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