| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 97 === Lithium niobate (LiNbO3) single crystal is one of the most widely used electro-optical materials, because the crystals are easily grown to large dimensions and with high optical uniformity. However, the low optical damage resistance that originated by light-induced refractive index changes restricts their industrial application. Incorporating optical damage resistance dopants (ODRD), such as MgO, ZnO provides potential ways to overcome the shortages. All of the optical applications of LiNbO3, photorefractive dopants are of high interest for holographic data storage. The Ru:LiNbO3 is one of the important holographic storage media because of its good photorefractive properties and non-volatility. In this work, Mg:Ru:LiNbO3 was grown for improving their optical damage resistance.
The Mg:Ru:LiNbO3 crystal was grown by the Czochralski method from a congruent melt composition. The as-grown crystal was crack-free and uni-diameter with the size of φ35mm×45mm. We discover that non-uniform distribution of Ru ion in the grown crystal has been improved as the MgO dopants. After UV-VIS spectrum detected, the Mg:Ru:LiNbO3 crystal also had two different absorption peak that can be considered a good candidate to be used for nonvolatile holographic storage. The effect of post treatment on the optical properties of Mg:Ru:LiNbO3 is also studied. Magnesium (Mg)-Ruthenium (Ru)-doped near-stoichiometric lithium niobate crystals (Mg:Ru:SLN) were prepared by the vapor transport equilibration (VTE) technique. The crystal also exhibites free light-induced scattering at the recording power density of I0 =800 W/cm2, which are favorable for industrial application.
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