Anisotropy of optical absorption spectra of rare-earth orthoaluminate DyAlO3

The polarization spectra of optical absorption for the 4f-4f transition 6H15/2 → 6F3/2 and 6H15/2 → 6F5/2 in the rare-earth orthoaluminate DyAlO3 have been studied experimentally at the temperature T=78 K. It has been shown that the non-trivial character of the polarization absorption spectra anisotropy for low temperatures can be explained by a contribution of the J-J ''mixing'' mechanism for the excited multiplets of the ground 4f(n) configuration of the Dy3+ ion in the low-symmetry crystalline field in the orthoaluminate structure. The results of numerical calculations of energies and wave functions of the Stark sublevels of the excited multiplets 6F3/2 and 6F5/2 are presented for the ground 4f9 configuration of the rare-earth Dy3+ ion in the crystalline field of Cs symmetry. (Abstract Copyright [2003], Wiley Periodicals, Inc.)