Observation of a narrow inner-shell orbital transition in atomic erbium at 1299 nm
Résumé
We report on the observation and coherent excitation of atoms on the narrow inner-shell orbital transition, connecting the erbium ground state [Xe]4f^12(3H6 )6s^2 to the excited state [Xe]4 f^11((4I15/2 )^0)5d(5D3/2 )6s2(15/2, 3/2)^07. This transition corresponds to a wavelength of 1299 nm and is optically closed. We perform high-resolutionspectroscopy to extract the gJ factor of the 1299-nm state and to determine the frequency shift for four bosonic isotopes. We further demonstrate coherent control of the atomic state and extract a lifetime of 178(19) ms, which corresponds to a linewidth of 0.9(1) Hz. The experimental findings are in good agreement with our semi-empirical model. In addition, we present theoretical calculations of the atomic polarizability, revealing several different magic-wavelength conditions. Finally, we make use of the vectorial polarizability and confirm a possible magic wavelength at 532 nm.
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