ОСОБЕННОСТИ ДЕФЕКТНОЙ СТРУКТУРЫ И ОПТИЧЕСКИЕ СВОЙСТВА КРИСТАЛЛА LiNbO3:Mg(5.05):Fe(0.009 мол.%)

The defects and optical properties of a LiNbO 3 :Mg(5.05):Fe(0.009 mol.%) crystal are studied by the methods of IR-absorption spectroscopy, Raman spectroscopy, laser conoscopy, and optical spectroscopy. It is established that the bands of absorption related to valent vibrations of OH groups shift to the highfrequency area and are narrower for this crystal compared to a nominally pure congruent crystal. It indicates a higher order in the OH groups location and the higher stiffness of O–H bonds in the structure of the LiNbO 3 :Mg(5.05):Fe(0.009 mol %) crystal than in a congruent crystal.