Magneto-Optical Trapping of Holmium Atoms

Abstract

We demonstrate sub-Doppler laser cooling and magneto-optical trapping of the rare earth element Holmium. Atoms are loaded from an atomic beam source and captured in six-beam ${\sigma }_{+}-{\sigma }_{-}$ molasses using a strong $J=15/2\leftrightarrow J=17/2$ cycling transition at $\lambda =410.5\mathrm{nm}$. Due to the small difference in hyperfine splittings and Landé $g$-factors in the lower and upper levels of the cooling transition the MOT is self-repumped without additional repump light, and deep sub-Doppler cooling is achieved with the magnetic trap turned on. We measure the leakage out of the cycling transition to metastable states and find a branching ratio $\sim 10^{-5}$ which is adequate for state resolved measurements on hyperfine encoded qubits.

5 figures, v2: numerical values in Table I corrected, v3: metastable decay rate value revised, v4: minor changes and eq. (2) corrected for Holmium

References in corpus (5)

• Bose-Einstein Condensation of Erbium
• Quantum degenerate dipolar Fermi gas
• Quantum computing with collective ensembles of multi-level systems
• Magneto-Optical Trap for Thulium Atoms
• Anisotropic sub-Doppler laser cooling in dysprosium magneto-optical traps

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