雙摻鎂釕鈮酸鋰單晶生長及特性之研究; Growth and properties of MgO and RuO2-doped lithium niobate crystals

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Title:	雙摻鎂釕鈮酸鋰單晶生長及特性之研究;Growth and properties of MgO and RuO2-doped lithium niobate crystals
Authors:	葉柏青;Po-Ching Yeh
Contributors:	機械工程研究所
Keywords:	單晶;鈮酸鋰;鎂釕;lithium niobate crystals;MgO and RuO2
Date:	2010-07-26
Issue Date:	2010-12-08 13:45:06 (UTC+8)
Publisher:	國立中央大學
Abstract:	鈮酸鋰晶體是近幾年來光電晶體中常被廣泛研究的光電材料，因為它可以透過不同元素的摻雜使得其有不同優異地光學性質表現，然而未摻雜任何元素之晶體在高功率能量雷射下會因晶體折射率變化而使入射能量大量發散問題，使其在光學運用上受到相當限制。因此近年來大量研究探討透過摻雜不同元素來提升鈮酸鋰晶體之抗光損傷能力。近來備受關注的光折變晶體Ru：LiNbO3晶體因為有兩個不同的能階可以被應用於非揮發性全像儲存且其光折變性質優異，但抗光損傷抵抗能力仍有待改善。因此本研究希望可以藉由摻雜Mg元素得到擁有高抗光損傷性質的Mg：Ru：LiNbO3晶體。本實驗室以自行架設柴式長晶爐體生長Mg：Ru：LiNbO3晶體，成功生長出兩組不同號數配比的晶體，晶體直徑約35mm，長度約為40mm左右，品質優良、等直徑且無裂痕。經由UV-Vis.吸收光譜的檢測發現Mg:Ru:CLN保留有Ru:CLN的兩個吸收峰值400nm和530nm，使其可以被應用於非揮發性全像記憶上。而透過OH-吸收光譜結果可以發現，當Mg 7mol% Ru 0.2 mol%號數時吸收峰值才偏移至3535cm-1處，對照ICP-AES結果確認Mg元素含量為6.3 mol%，且經過VTE處理後吸收峰值偏移至3466cm-1處，証實已成功製備出Mg:Ru:SLN。最後藉由光損傷的量測，得知Mg:Ru:LiNbO3隨Mg元素濃度增加而得到改善，當Mg摻雜量達5mol%時，Mg:Ru:LiNbO3之抗光損傷性值可以得到改善。 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%.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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