Photodamage of Mg: Er: LiNbO3 crystal wave-guide substrate

Er:LiNbO3 and Mg:Er:LiNbO3 crystals were grown by the Czochralski method. All of crystals were possessed with polarization. In order to investigate the mechanism of OH- absorption peak shift, the infrared absorption spectra of the crystals were measured. The absorption edge of ultraviolet-visible absorption spectrum of Mg:Er:LiNbO3 crystal showed a shift towards shorter wavelength. The fluorescence spectra of the crystals were investigated. The laser vibrate of Mg:Er:LiNbO3 crystal was realized easily at 1.54mum, 0.887mum and 0.5 mum. Benzoic acid was used as proton transfer reagent to make the Wave-guide substrate. By using the holograph method, the photodamage resistance ability and the enhance mechanism of the Mg:Er:LiNbO3 crystal wave-guide substrate was measured.