Optical properties of KGd(WO4)2 single crystals studied by Brillouin spectroscopy by D. Kasprowicz, S. Mielcarek, A. Majchrowski, E. Michalski, and M. Drozdowski

Crystal Research and Technology

Cryst. Res. Technol. 41, 541 (2006) - Abstract -

Optical properties of KGd(WO₄)₂ single crystals studied by Brillouin spectroscopy

D. Kasprowicz, S. Mielcarek*, A. Majchrowski**, E. Michalski**, and M. Drozdowski

Faculty of Technical Physics, Poznan University of Technology, ul. Nieszawska 13 A, 60-965 Poznan, Poland
*Institute of Physics, Adam Mickiewicz University, ul. Umultowska 85, 61-614 Poznan, Poland
**Institute of Applied Physics, Military University of Technology, ul. Kaliskiego 2, 00-908 Warsaw, Poland

Keywords	double tungstates, KGd(WO₄)₂, Brillouin scattering, refractive indices
PACS	78.35.+c, 78.30.-j
DOI	10.1002/crat.200510622

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.

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