Anisotropic light-shift and magic-polarization of the intercombination line of Dysprosium atoms in a far-detuned dipole trap

Abstract

We characterize the anisotropic differential ac-Stark shift for the Dy $626$ nm intercombination transition, induced in a far-detuned $1070$ nm optical dipole trap, and observe the existence of a "magic polarization" for which the polarizabilities of the ground and excited states are equal. From our measurements we extract both the scalar and tensorial components of the dynamic dipole polarizability for the excited state, ${\alpha }_E^{\text{s}}=188(12){\alpha }_{\text{0}}$ and ${\alpha }_E^{\text{t}}=34(12){\alpha }_{\text{0}}$, respectively, where ${\alpha }_{\text{0}}$ is the atomic unit for the electric polarizability. We also provide a theoretical model allowing us to predict the excited state polarizability and find qualitative agreement with our observations. Furthermore, we utilize our findings to optimize the efficiency of Doppler cooling of a trapped gas, by controlling the sign and magnitude of the inhomogeneous broadening of the optical transition. The resulting initial gain of the collisional rate allows us, after forced evaporation cooling, to produce a quasi-pure Bose-Einstein condensate of ${}^{162}$Dy with $3\times 10^4$ atoms.

arXiv comment6 pages, 4 figures

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Cited by in corpus (15)

• Dipolar physics: A review of experiments with magnetic quantum gases
• Enhanced magnetic sensitivity with non-gaussian quantum fluctuations
• Trapping and imaging single dysprosium atoms in optical tweezer arrays
• Observation of a narrow inner-shell orbital transition in atomic erbium at 1299 nm
• Optical Tweezer Arrays of Erbium Atoms
• Magic polarization for light shift cancellation in two-photon optical clocks
• Production and stabilization of a spin mixture of ultracold dipolar Bose gases
• Measurement of the dynamic polarizability of Dy atoms near the 626-nm intercombination line
• Characterisation of three-body loss in ${}^{166}$Er and optimised production of large Bose-Einstein condensates
• Loss features in ultracold ${}^{162}$Dy gases: two- versus three-body processes
• Blue repulsive potential for dysprosium Bose-Einstein condensates
• Narrowline cooling of dysprosium atoms in an optical tweezer array
• Two-Body Contact Dynamics in a Bose Gas near a Fano-Feshbach Resonance
• Van der Waals coefficients for interactions of dysprosium and erbium atoms with alkali-metal and alkaline-earth-metal atoms
• Determination of the ground state polarizability of ${}^{162}$Dy near 530 nm