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OH- Absorption Spectra of Lithium Niobate Crystals Diffusion-Doped by Copper

The OH- groups absorption band depth profiles of LiNbO3 single crystals were investigated after high-temperature treatment in the presence of CuO powder. The changes of the optical absorption caused by diffusion of Cu were registered in the direction perpendicular to the direction of diffusion. The correlation of the OH- groups absorption band intensities and positions with the spatial distributions of copper ions is revealed.