Spectroscopic properties of KGd(WO4)(2) and KGd(WO4)2 : Ho3+ single crystals studied by Brillouin and Raman scattering methods

摘要

KGd(WO4)(2) single crystals, pure and doped with holmium ions Ho3+ at 0.5 and 1% concentrations were investigated by Brillouin and Raman scattering methods. Polarized Raman spectra of KGd(WO4)(2) and KGd(WO4)(2):Ho3+ single crystals have been measured at room temperature. The assignment of the Raman-active Ag and 139 modes have been performed. Brillouin spectra were collected for the acoustic phonons propagating in [100], [001], [101], [-101], [110], [-110], [011] and [0-11] directions in KGd(WO4)(2) and KGd(WO4)(2):Ho3+ single crystals at room temperature. Obtained results have been discussed in terms of the influence of the doping concentration on the lattice dynamics and crystal structure. (c) 2006 Elsevier B.V. All rights reserved.