Preparation of new type storage material Mn:Cu:LiNbO_3

摘要

Lithium niobate crystals doped with the photorefractive sensitizing impurities of MnO and/or CuO have been grown by the Czochralski method. The crystals were treated with the oxidation or reduction. The absorption spectra of LiNbO_3, Mn:LiNbO_3, Cu:LiNbO_3 and Mn:Cu:LiNbO_3 were measured. For these four crystals, the absorption edge of pure LiNbO_3 is at the shortest wavelength, and that of Mn:Cu:LiNbO_3 is located at the longest wavelength. The exponential gain coefficient, diffraction efficiency, response time and phase conjugate reflectivity were measured. Mn:Cu:LiNbO_3 has the excellent photorefractive properties and holographic storage properties.