| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 98 === In recent years, lithium niobate (LiNbO3) single crystal is one kind of optoelectronic material which could be doped with elements to achieve different superior optical properties has been investigated and applied extensively. However, the energy of incident high power laser almost disperses due to the variation in refractive index of intrinsic LiNbO3 and its application of optics has been limited. Therefore, LiNbO3 had been doped with different element in order to enhance the optical damage resistance. Among these studies, Ru:LiNbO3 possesses superior photorefractive properties that could be applied to non-volatility holographic data storage due to the two different energy levels,but it should be improved optical damage problem . In our research, we attempt to obtain Mg:Ru:LiNbO3 crystal with high optical damage resistance by doping with Mg.
In our experiments, we have grown the Mg:Ru:LiNbO3 crystal by Czochralski method. We successfully grew two Mg:Ru:LiNbO3 crystals which are 35mm in diameter, 40mm in length, great quality and non-crackled with different percentages of mole. The UV-Vis. absorption spectrum indicated that Mg:Ru:CLN reserved the absorption peaks which are the same in Ru:CLN absorption spectrum located at 400nm and 530nm, hence it might be applied to non-volatility holographic data storage. In OH- absorption spectrum, we discovered that the absorption peak shifted to 3535cm-1 as the percentages of mole are Mg 7mol% and Ru 0.2mol%. Comparing the ICP-AES results, we made sure that the percentage of mol, Mg 6.3mol%. Furthermore, the absorption peak shifted to 3466cm-1 after VTE treatment and it verified that Mg:Ru:SLN was successfully fabricated. According to the optical damage measurement, we know that the optical damage resistance could be improved by increasing the Mg concentration to 5mol%.
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