Abstract
ABSTRACT The congruent Fe (0.03%wt):LiNbO 3 crystals doped with different concentration of MgO (0, 2, 4,6mol %) were grown by Czochralski method in air atmosphere. The ultraviolet-visible absorption spectra, infrared absorption spectra of the crystals were measured in order to analyze their structure. The absorption edge of the Mg: Fe: LiNbO 3 crystals shifted to the ultraviolet band compared with that of Fe: LiNbO 3. The OH - absorption peaks of and crystals located at about 3483cm -1 , while those of and crystals shifted to 3536cm -1 . The mechanism of OH - absorption peak shifting was studied. The light scattering ability resistance of Mg: Fe: LiNbO 3 crystal was observed by straightly observing transmission facula distortion method. It indicated that light scattering ability resistance of crystals was three orders of magnitude higher than that of Fe: LiNbO 3 crystals. The exponential gain coefficient, diffraction efficiency and respond time of Mg: Fe: LiNbO 3 crystals were measured by two-wave-coupling technology. The results indicate that exponential gain coefficient of Mg: Fe: LiNbO
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