Degenerate Raman sideband cooling of 39K

Abstract

We report on the first realization of sub-Doppler laser cooling of 39K atoms using degenerate 3D Raman sideband cooling. We take advantage of the well-resolved excited hyperfine states on the D1 optical transition to produce spin polarized samples with $1.4\times 10^8$ atoms at temperatures of 1.8 $\mu$K. The phase-space densities are $\ge 10^{-4}$, which significantly improves the initial conditions for a subsequent evaporative cooling step. The presented cooling technique using the D1 line can be adapted to other atomic species and is applicable to high-resolution imaging schemes in far off-resonant optical lattices.

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Cited by in corpus (8)

• Near-ground-state cooling of atoms optically trapped 300nm away from a hot surface
• Motional Ground State Cooling Outside the Lamb-Dicke Regime
• Generation of high-purity, low-temperature samples of ${}^{39}$K for applications in metrology
• Laser Cooling of 85Rb Atoms to the Recoil Temperature Limit
• Nonequilibrium thermodynamics and optimal cooling of a dilute atomic gas
• Degenerate Raman sideband cooling of 40K atoms
• Sub-Doppler laser cooling of ${}^{39}$K via the 4S$\to$5P transition
• Prospects for single photon sideband cooling of optically trapped neutral atoms