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

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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