利用氣相傳輸平衡產生近化學計量配比之摻釕鈮酸鋰晶體特性研究

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黃子銘(Tzu-ming Huang) 查詢紙本館藏

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機械工程學系

論文名稱

利用氣相傳輸平衡產生近化學計量配比之摻釕鈮酸鋰晶體特性研究
(Properties of Ru-doped near-stoichiometric lithium niobate crystals produced by vapor transport equilibration)

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摘要(中)

本論文是利用氣相傳輸平衡法(VTE)將由柴式長晶法所生長的共熔配比之摻釕鈮酸鋰(Ru:CLN)轉換成近化學計量配比之摻釕鈮酸鋰(Ru:nSLN)晶體。當VTE處理時間增長時，會使晶體中的[Li]/[Nb] 比值增加，造成UV/VIS 吸收邊往紫外光偏移，並使得位於530nm波長下的吸收係數下降。而OH-吸收光譜會因為 [Li]/[Nb]比值的增加，使位在3482cm-1 波數的寬吸收峰漸漸地衰減，同時也使得位在3466cm-1 波數的吸收峰漸漸地增強，並且隨著VTE 反應時間增長時，此吸收峰變的較尖端。當VTE 處理時間達到200小時，則可以得到近化學計量配比摻釕鈮酸鋰晶體。藉由使用532nm 雷射波長的雙波耦合實驗可以得知近化學計量配比摻釕鈮酸鋰有良婕的光學性質，並與共熔配比摻釕鈮酸鋰晶體的比較之下，擁有較大的指數增益係數、較低的繞射效率、較快的響應時間、較高的光敏感性、較大的動態範圍與較小的黑暗衰減時間常數。

摘要(英)

In this thesis, Ruthenium (Ru)-doped near-stoichiometric lithium niobate crystals (Ru:nSLN) were prepared by the Vapor Transport Equilibration (VTE) method from Ru-doped congruent lithium niobate grown using the Czochralski method. Increasing the duration time of the VTE treatment would cause the ratio of [Li]/[Nb] in the crystal to increase, which in turn caused that the absorption edges to shift to violet, and the absorption coefficient in the UV/VIS absorption spectra at 530nm to decrease. The broad band in the OH- absorption spectra located at 3482 cm-1 also gradually decreased while another band located at 3466cm-1 gradually increased. The shape became sharper as the VTE treatment time increased. When the VTE treatment time reached 200 hours, Ru-doped near-stoichiometric lithium niobate crystals were obtained. Two-beam coupling examination with a 532nm laser showed that the Ru-doped near-stoichiometric lithium niobate compares with Ru-doped congruent lithium niobate crystals had a larger exponential gain coefficient, lower diffraction efficiency, faster response time, higher sensitivity, higher dynamic range and smaller dark decay time constant than did the Ru-doped congruent lithium niobate crystals.

關鍵字(中)

★ 化學計量配比
★ 鈮酸鋰
★ 摻釕
★ 氣相傳輸平衡

關鍵字(英)

★ VTE
★ LiNbO3
★ Ru
★ SLN

論文目次

摘要....................................................................................................................I
Abstract.............................................................................................................II
致謝.................................................................................................................III
表目錄...............................................................................................................VI
符號說明...........................................................................................................IX
第一章簡介...............................................................................................1
1.1 緒論......................................................................................................1
1.2 鈮酸鋰材料簡介..................................................................................2
1.3 化學計量配比鈮酸鋰晶體生長方式..................................................4
1.4 氣相傳輸平衡法 (Vapor Transport Equilibration)........................7
1.5摻雜之鈮酸鋰晶體...............................................................................8
1.6 晶體光學性質相關研究....................................................................10
1.7 研究動機............................................................................................13
第二章實驗設備、材料製程與研究方法............................................20
2.1 實驗設備............................................................................................20
2.2 晶體處理............................................................................................22
2.3 氣相傳輸平衡製程(VTE).................................................................24
2.4 晶體檢測儀器....................................................................................25
2.5 晶體後續處理及檢測方法................................................................28
2.6 光學實驗檢測....................................................................................29
第三章實驗結果與討論........................................................................38
3.1 純鈮酸鋰晶體....................................................................................38
3.2 摻釕鈮酸鋰之 VTE 處理................................................................40
3.3 Ru:nSLN 之鋰濃度檢測...................................................................42
3.4 摻雜釕鈮酸鋰之光學性質檢測........................................................44
第四章結論.............................................................................................67
參考文獻...................................................................................................68

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指導教授

陳志臣(Jyh-chen Chen)

審核日期

2007-7-12

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