Anisotropy of optical absorption spectra of rare‐earth orthoaluminate DyAlO₃

Abstract The polarization spectra of optical absorption for the 4f–4f transition 6 H 15/2 → 6 F 3/2 and 6 H 15/2 → 6 F 5/2 in the rare‐earth orthoaluminate DyAlO 3 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 Dy 3+ 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 6 F 3/2 and 6 F 5/2 are presented for the ground 4f 9 configuration of the rare‐earth Dy 3+ ion in the crystalline field of C s symmetry.

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