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Zeeman-Hyperfine measurements of a pseudo-degenerate quadruplet in CaF₂ : Ho³⁺

Russian version

DOI: 10.21883/EOS.2022.01.52984.40-21

Smith K. M.^1,2,3, Reid M. F.^1,2, Wells J. R.^1,2

¹School of Physical and Chemical Sciences, University of Canterbury, Christchurch, New Zealand
²The Dodd-Walls Centre for Photonic and Quantum Technologies, New Zealand
³Research School of Physics and Engineering, The Australian National University, Canberra, Australia

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Abstract
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We report Zeeman infra-red spectroscopy of electronic-nuclear levels of ⁵I_8 ⁵I₇ transitions of Ho³⁺ in the C_4v(F^-) centre in CaF₂ with the magnetic field along the < 111> direction of the crystal. Transitions to the lowest ⁵I₇ state, an isolated electronic doublet, and the next group of states, a pseudo-quadruplet consisting of a doublet and two nearby singlets, exhibit strongly non-linear Zeeman splittings and intensity variations. Simulated spectra based upon a crystal-field analysis give an excellent approximation to the data, illustrating the strong predictive ability of the parametrised crystal-field approach. Anti-crossings in the hyperfine splittings, the basis of quantum information storage in rare-earth doped insulating dielectrics, are also predicted. Keywords: holmium; rare earth; Zeeman; spectroscopy; crystal-field.

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