$\Lambda$-enhanced grey molasses on the $D_2$ transition of Rubidium-87 atoms

Abstract

Laser cooling based on dark states, i.e. states decoupled from light, has proven to be effective to increase the phase-space density of cold trapped atoms. Dark-states cooling requires open atomic transitions, in contrast to the ordinary laser cooling used for example in magneto-optical traps (MOTs), which operate on closed atomic transitions. For alkali atoms, dark-states cooling is therefore commonly operated on the $D_1$ transition $n{S}_{1/2}\to n{P}_{1/2}$. We show that, for ${}^{87}\text{Rb}$, thanks to the large hyperfine structure separations the use of this transition is not strictly necessary and that $"$quasi-dark state$"$ cooling is efficient also on the $D_2$ line, $5S_{1/2}\to 5P_{3/2}$. We report temperatures as low as $(4.0\pm 0.3)\mu$K and an increase of almost an order of magnitude in the phase space density with respect to ordinary laser sub-Doppler cooling.

References in corpus (21)

• A quantum gas microscope - detecting single atoms in a Hubbard regime optical lattice
• Single-Atom Resolved Fluorescence Imaging of an Atomic Mott Insulator
• Single-atom imaging of fermions in a quantum-gas microscope
• A Quantum Gas Microscope for Fermionic Atoms
• Site-resolved Imaging of Fermionic Lithium-6 in an Optical Lattice
• Imaging and addressing of individual fermionic atoms in an optical lattice
• Laser cooling to quantum degeneracy
• Λ-enhanced Sub-Doppler Cooling of Lithium Atoms in D1 Gray Molasses
• Sub-Doppler laser cooling of fermionic 40K atoms in three-dimensional gray optical molasses
• Gray molasses cooling of ${}^{39}$K to a high phase-space density
• Creation of a Bose-condensed gas of rubidium 87 by laser cooling
• Efficient all-optical production of large ${}^6$Li quantum gases using D${}_1$ gray-molasses cooling
• A double species ${}^{23}$Na and ${}^{87}$Rb Bose-Einstein condensate with tunable miscibility via an interspecies Feshbach resonance
• Quantum interference-enhanced deep sub-Doppler cooling of 39 K atoms in gray molasses
• Intense slow beams of bosonic potassium isotopes
• Simultaneous sub-Doppler laser cooling of fermionic ${}^6$Li and ${}^{40}$K on the D${}_1$ line: Theory and Experiment
• Sub-Doppler cooling of sodium atoms in gray molasses
• Production of large ${}^{41}$K Bose-Einstein condensates using D1 gray molasses
• Sub-Doppler laser cooling of 40K with Raman gray molasses on the D2 line
• Fast production of Bose-Einstein condensates of metastable Helium
• Raman cooling imaging: Detecting single atoms near their ground state of motion

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