Anisotropy of absorption spectra of the rare-earth orthoaluminate TbAlO3 in polarized light

Polarized spectra of the optical absorption of the 4f → 4f transition 7 F 6 → 5 D 4 in rare-earth orthoaluminate TbAlO3 were experimentally studied at temperature T = 78 K. It was shown that the nontrivial character of the absorption anisotropy of TbAlO3 at low temperatures could be related either to the symmetry of wave functions of the Stark sublevels of 7 F 6 and 5 D 4 multiplets combining in the optical transitions under study or to optical experiment geometry that takes into account the orientation of incident light polarization relative to the crystal axes and the axes of local coordinate systems of a rare-earth ion in orthoaluminate.

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