Features of the Defect Structure of the Compositionally Homogeneous Crystal LiNbO:Er(3.1 wt%) and the Gradient Crystal LiNbO:Er and Their Manifestation in the IR Transmission Spectra in the Region of Stretching Vibrations of Hydrogen Atoms of OH-Groups.

Based on the analysis of the IR transmission spectra in the region of stretching vibrations of hydrogen atoms of OH-groups, it was established that the oxygen-octahedral MeO clusters (Me-Li, Nb, vacant octahedron V, impurity ion) of the structure of the compositionally homogeneous crystal LiNbO:Er(3.1 wt%) and the gradient crystal LiNbO:Er(congruent composition by the main components, Er gradient of 0.55 at%/cm) have a shape close to the regular one.

Features of the Defect Structure of LiNbO:Mg:B Crystals of Different Composition and Genesis.

We proposed and investigated a refinement of technology for obtaining Mg-doped LiNbO (LN) crystals by co-doping it with B. LN:Mg (5.0 mol%) is now the most widely used material based on bulk lithium niobate.

Structure, Optical Properties and Physicochemical Features of LiNbO:Mg,B Crystals Grown in a Single Technological Cycle: An Optical Material for Converting Laser Radiation.

Two series of LiNbO:Mg:B crystals have been grown and studied. Two doping methods-have been used. The crystals-have been co-doped with Mg and a non-metallic dopant, B.

Growing, Structure and Optical Properties of LiNbO:B Crystals, a Material for Laser Radiation Transformation.

Physical and chemical properties have been studied in lithium niobate (LiNbO, LN) crystals grown by Czochralski from a boron doped melt. Optical uniformity and optical damage resistance of LiNbO:B crystals have been compared with control crystals of nominally pure congruent (CLN) and near-stoichiometric (NSLN KO) composition. LiNbO:B crystals structure has been studied.

Features of the Defect Structure and Luminescence of Nominally Pure Lithium Niobate Crystals Produced Using Different Technologies.

We have established that luminescence in lithium niobate crystals both congruent and near-stoichiometric (R ≈ 1) is due to point defects in the cationic sublattice and intraconfigurational transitions in the oxygen-octahedral NbO clusters. We have also determined that the main contribution to the luminescence in the visible and near IR regions is made by luminescence centers with the participation of Nb defects: the Nb-Nb bipolaron pair and the Nb-O defect in a congruent crystal. The minimum intensity of bipolaron luminescence has been observed in stoichiometric crystals obtained using different technologies.