Abstract
High resolution (0.04 cm−1) absorption spectra of Dy3+-doped YAl3(BO3)4 (YAB) single crystals were measured by Fourier transform spectroscopy in the spectral(2000–23 000 cm−1) and temperature (9–300 K) ranges. Samples with nominal 1 and 4%Dy/Y molar ratioswere studied. Dy3+ transitions from the 6H15/2 ground state to the 6H13/2, 6H11/2,6H9/2+ 6F11/2,6H7/2+ 6F9/2,6H5/2,6F7/2,6F5/2,6F3/2, and4F9/2 excited states wereanalysed. A small (∼3.3 cm−1) splitting between the first two sublevels of the6H15/2 ground manifold was detected. The experimentally determined energy levels were fittedwith a single-ion Hamiltonian and the crystal-field parameters were obtained. The sameprocedure was applied to analyse the previously published high resolution spectra ofYAB:Er3+, leading to a reliable unified picture for the two dopants.
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