Magnetooptics of quintet states of Tb<sup>3+</sup> ion in terbium–yttrium aluminum garnet
Abstract
Abstract The luminescence spectra and the degrees of magnetic circular polarization of luminescence (MCPL) have been studied in paramagnetic garnet Tb 0.2 Y 2.8 Al 5 O 12 (YAG:Tb 3+ ) for the radiative 4 f –4 f transition 5 D 4 ® 7 F 6 . The features of the spectral dependencies of the MCPL degree with allowed (in symmetry) optical transitions between the Stark sublevels of the ground 7 F 6 and excited 5 D 4 multiplets of the non‐Kramers rare‐earth Tb 3+ ion have been found in the YAG garnet structure. In the paramagnetic garnet Tb 0.2 Y 2.8 Al 5 O 12 within the close ultraviolet spectral range, the non‐trivial features of the spectra of magnetic circular dichroism (MCD) have been found; they evidence a significant contribution of the quasi‐doublet states in the multiplets 5 D 3 , 5 G 5 and 5 L 10 to magnetooptics of the 4 f –4 f transitions. The results of numerical calculations of the energy and wave functions have been presented for some Stark sublevels of the 5 D 4 and 7 F 6 multiplets of the Tb 3+ ion in the crystalline field of D 2 symmetry. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)