Abstract
High homogeneity heavily MgO-doped lithium niobate(MgLN for short) single crystals were grown by Czochralski method.The as-grown crystals were poled at high temperature,so as to obtain single ferroelectric domain structure.UV absorption edge,OH absorption peak,optical homogeneity of the crystal were tested,respectively.Micro-compositions along the radial direction were analyzed by EDS method and "line scan" of the distribution of Mg element along the radial direction was investigated by WDS method.The results showed that high homogeneity MgLN crystals were obtained with proper starting composition and improved growth process of Czochralski technology.UV absorption edge at 308 nm and OH absorption peak at 2828 nm were observed.The optical homogeneityΔn5.11×10~(-5). Finally,ferroelectric domain structure was observed by optical microscope by chemical etching method.High uniformity single ferroelectric domain structure was obtained by applying an external electric field at 1200℃.
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