以Cz法生長摻鎂鈮酸鋰單晶

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鄭文翔(Wen-Hsiang Cheng) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

以Cz法生長摻鎂鈮酸鋰單晶
(MgO doped lithium niobate single crystals were grown by the Czochralski method.)

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摘要(中)

鈮酸鋰晶體是目前光電晶體種類裡面最常被拿來使用的光電材料，因此多年來研究繁多。然而，未摻雜共熔配比鈮酸鋰晶體受光折效應過強時影響會導致光損傷，通常可透過摻雜一些MgO或ZnO來降低損傷。而本實驗是以自行架設的柴式生長法(Czochralaki；Cz)生長出各種不同濃度(1、3、5mol%)的摻鎂共熔配比鈮酸鋰晶體(Congruent Lithium Niobate；CLN)，再利用極化(poling)處理使晶體的多疇結構(Muti-domain)，轉換成單疇(Single-domain)晶體。最後利用氣相傳輸平衡法(Vapor Transport Equilibration；VTE)將極化處理完的共熔配比的摻鎂鈮酸鋰晶體轉換成近化學計量配比摻鎂鈮酸鋰晶體(Stoichiometric Lithium Niobate；SLN)。
從實驗結果發現，極化處理時在施加一定的電壓下，電流會漸漸上升至最大值，此最大值會在1.5~2.5mA/cm2，雖然摻鎂可以使晶體的抗光強度提高很多，然而經過VTE處理後的摻鎂鈮酸鋰，會隨著原本CZ生長摻鎂量的增加而使能經由VTE進入晶體內的鋰離子變少。對於摻鎂鈮酸鋰的性質檢測，我們使用UV 吸收光譜、FTIR 光譜與Raman光譜等光學儀器來確定其性質，並從結果中來討論其中的物理特性。

摘要(英)

LiNbO3 crystals is used electrictel-opto materials in the electrictel-opto crystals, thus has been studied for many years. However, high-intensity single-beam photorefractive data on un-doped congruent LiNbO3 crystals show occurrence of a well-defind intensity threshold for optial damage of the output beam. This problem is doped MgO and ZnO. In the study, Magnesium (Mg) doped lithium niobate (LiNbO3) single crystals with different Mg concentrations were grown by the Czochralski method from a congruent melt composition. The electic field parameter to obtain single-domain crystals are presented in situ poling of crystals. Magnesium(Mg)-doped near-stoichiometric lithium niobate crystals (Mg:SLN) were prepared by the vapor transport equilibration (VTE) technique from Mg-doped congruent lithium niobate crystals (Mg:CLN).
For the observation of experimenting result, the poling was carried out during growth by applying a DC electric field across the crystal-melt system with current densities varying from 1.5 to 2.5 mA/cm2. However, the doping concentration of Mg is hard to reach its second threshold in crystals grown by normal Czochralski technique. So, vapor transport equilibration method was employed to improve the [Li]/[Nb] ratio of Mg:LiNbO3 crystals. We investigate the optical properties of the crystal fibers form the equipments of UV absorption edge, IR absorption spectrum and Raman spectrum. We also discuss the physic characteristics from the measured optical properties.

關鍵字(中)

★ 鈮酸鋰
★ 鎂
★ 極化

關鍵字(英)

★ poling
★ LiNbO3
★ MgO

論文目次

摘要··········································································································I
英文摘要··························································································II
目錄········································································································III
表目錄····································································································V
圖目錄···································································································VI
第一章緒論·····························································································1
1-1前言·····························································································1
1-2鈮酸裡晶體特性··········································································2
1-2-1鈮酸鋰晶體結構··································································2
1-2-2鈮酸鋰晶體性質································································3
1-2-3共熔配比與化學計量配比鈮酸鋰（CLN and SLN）之差別····4
1-3柴式提拉法··················································································6
1-3-1熱場與流場對晶體生長之影響············································7
1-4鈮酸鋰晶體之摻雜影響·······························································8
1-4-1摻鎂之鈮酸鋰特性·····························································10
1-5氣相傳輸平衡法(Vapor Transport Equilibration) ··························11
1-6拉曼光譜原理與應用·································································12
1-7研究動機與目的········································································13
第二章實驗設備與流程·······································································22
2-1實驗設備··················································································22
2-2實驗流程··················································································24
2-2-1配置粉末與設備調整··························································25
2-2-2晶體生長········································································26
2-2-3研磨拋光、極化與VTE處理············································27
2-2-4晶體檢測········································································29
第三章結果與討論···············································································40
3-1摻鎂鈮酸鋰晶體生長································································40
3-2 晶體極化處理···········································································42
3-3 VTE處理··················································································43
3-4 晶體各檢測結果···································································44
3-4-1 Mg:LiNbO3的UV/VIS吸收光譜·······································44
3-4-2 Mg:LiNbO3的紅外光吸收光譜·········································45
3-4-3 Mg:LiNbO3的濃度分佈····················································47
3-4-4 Mg:LiNbO3的光損傷抵抗················································48
3-4-5 Mg:LiNbO3的拉曼光譜···················································48
第四章結論··························································································70
參考文獻································································································71

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指導教授

陳志臣(Jyh-Chen Chen)

審核日期

2008-7-23

推文