Abstract
The results of a study of KGd(WO4)2 single crystals by Brillouin scattering method are presented. The Brillouin spectra for the acoustic phonons propagating in the [100], [010], [001], [110] and [101] directions, taken in 90° and 180° scattering geometry at room temperature have been recorded. Using the Brillouin spectroscopy the refractive indices for some directions of KGd(WO4)2 crystals were determined. The refractive indices were also calculated for the same directions by the rotation transformation of the principal optical axes of the optical indicatrix to the crystallographic directions of KGd(WO4)2 crystals. Moreover, some anomalies of the acoustic phonons propagating connected with birefringence of KGd(WO4)2 crystals were discussed. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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