Abstract
Abstract—The congruent charge LiNbO3:Zn (2.44 wt %) was synthesized using precursor Nb2O5:Zn (2.83 wt %) by the method of homogeneous doping. The LiNbO3:Zn crystal (2.12 wt %) was grown from this charge by the Czochralski method. The crystal demonstrates high chemical uniformity of Zn dopant distribution along the growth axis. The same distribution is characteristic of crystals obtained by usual direct doping. The homogeneously doped LiNbO3:Zn crystal (2.12 wt %) and the LiNbO3:Zn (2.02 wt %), LiNbO3:Zn (2.05 wt %), and LiNbO3:Zn (2.12 wt %) crystals close to this composition obtained by method of direct doping, as well as LiNbO(3cong), were compared to study defectiveness and optical and structural homogeneity. The method of IR absorption spectroscopy, photoinduced light scattering, and laser conoscopy were used for the study. All studied crystals show no photorefractive response, as can be seen from photoinduced light scattering. The conoscopic patterns of a crystal LiNbO3: Zn (2.12 wt %, homogeneous doping) are strained, which can be connected with a greater photoinduced ability to scatter light than in other crystals. The ability is caused by microstructures, clusters, and residual domain structures. However IR spectra demonstrate narrowing of bands, which can be explained by the fact that homogeneous doping of a Nb2O5 precursor with zinc contributes to the ordering of the lithium sublattice of a LiNbO3:Zn crystal and ordering of H+ protons compared to the ordering in a LiNbO3cong crystal. This effect is highly unusual at this concentration of the dopant.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call