Abstract
We have investigated the Raman spectra of strongly doped crystals that were grown from batches of different genesis. The LiNbO3:Mg(5.3 mol %) and LiNbO3:Mg:Fe(5.01, 0.005 mol %) crystals were obtained using methods of homogeneous doping and the LiNbO3:Mg(5.1 mol %) crystal was obtained using a solid-phase master addition alloy, while the LiNbO3:Zn(4.5 mol %) crystal was grown using direct doping. In the Y(ZZ){ie269-1} scattering geometry, we have revealed the occurrence of lines in the spectrum that correspond to fundamental vibrations of the A2 symmetry species, which are forbidden by the selection rules for the {ie269-2} space group. The occurrence of lines in the spectrum that correspond to fundamental vibrations of the A2 symmetry species has been explained by the existence of microstructures and clusters in strongly doped LiNbO3 crystals, which lead to significant local changes in the symmetry of the crystal.
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