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研究生:胡明理
研究生(外文):Ming-Li Hu
論文名稱:Zn:LiNbO3之晶體生長與其特性研究
論文名稱(外文):Growth and Properties of Zn:LiNbO3 Crystals
指導教授:張正陽張正陽引用關係
指導教授(外文):Jenq-Yang Chang
學位類別:博士
校院名稱:國立中央大學
系所名稱:光電科學研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:158
中文關鍵詞:週期性極化非線性光學鐵電性矯頑場掺鋁鈮酸鋰
外文關鍵詞:Period PolingZn:LiNbO3
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本論文主要研究Zn:LiNbO3晶体之生長及其物理特性,MgO與ZnO的摻雜都可使LiNbO3的抗光強度提高100倍以上,但其摻雜之濃度閥值卻不同,前者為5.0 mol% Mg:LiNbO3;後者卻為7.5 mol% Zn:LiNbO3。二種摻雜之晶体,在濃度閥值所表現的物理特性比純LiNbO3優良,尤其是Zn:LiNbO3鐵電性矯頑場的降低,已接近計量比鈮酸鋰之矯頑場強度,有助於增加週期性電疇反轉結構之厚度及工程之改善。
吾人利用柴式提拉法生長不同濃度之Zn:LiNbO3晶体,藉由穿透率,晶格常數,熱差分析,倍頻量測,OH־吸收光譜,拉曼光譜及電滯迴線的測量來分析Zn:LiNbO3晶体的特性及其摻雜機制,主要獲得以下之結果:
(1).在生長較高濃度晶体時,易發生組份過冷之現象,在晶体尾端產生所謂的分格結構,此現象可以增加溫場之溫度梯度來改善。
(2).由Zn:LiNbO3晶体的X-ray晶格常數,穿透率及拉曼光譜對氧化鋅濃度之關係,可知Zn:LiNbO3晶体在氧化鋅濃度為2.0、5.0及7.5 mol%附近有摻雜機制上的變化。
(3).隨摻雜濃度之提高,在閥值濃度之晶体,其電疇反轉之起始電場可降低至矯頑場以下,但電疇反轉之時間增加,電疇反轉後達穩定之時間減少。自發極化大小對濃度之變化並不敏感。
(4).濃度7.5 mol% Zn:LiNbO3晶体之矯頑場可降低至5.0 kV/mm以下,內場可降低至0.6 kV/mm,其數值已非常接近計量比鈮酸鋰晶体之數值。有助於週期性極化結構之改善。
(5).Zn原子進入LiNbO3晶体之取代方式,在小於5.0 mol%時,Zn以不同比例同時取代Li位置之Li及NbLi,至5.0 mol%時,NbLi被取代完畢;濃度在5.0~7.5 mol%之間,則完全取代Li位置之Li;超過7.5 mol%,則以3:1之比例取代Li及Nb。
(6).Zn離子進入LN晶格中產生(ZnLi)+及(ZnNb)3-,與(NbLi)4+比較,對鐵電性矯頑場及內場之影響程度為(NbLi)4+> (ZnNb)3- > (ZnLi)+。

實驗證明,7.5 mol% Zn:LiNbO3晶体為優良之晶体材料,其生長容易,易於加工,穿透率高,結構緊緻,非線性光學性質佳,矯頑場及內場強度小,已接近計量比鈮酸鋰之性質,在微電疇結構工程上深具發展之潛力。
The growth and properties of Zn:LiNbO3 crystals were investigated.
論文提要 ………………………………………………………... I
誌謝 ……………………………………………………………… III
目錄 ……………………………………………………………… IV
圖目錄 …………………………………………………………… VII
表目錄 …………………………………………………………… XII
第一章 緒論 …………………………………………… 1
1-1 前言 ……………………………………………………… 1
1-2 鈮酸鋰晶体之特性 ……………………………………… 4
1-2-1 鈮酸鋰晶体結構 ……………………………………… 4
1-2-2 鈮酸鋰晶体之物理性質 ……………………………… 8
1-3 鈮酸鋰晶体的摻雜 ………………………………………… 20
1-3-1 提高抗光強度之摻雜 …………………………………. 20
1-3-2 擴散的摻雜 ……………………………………………. 21
1-3-3 改善光折效應的摻雜 …………………………………. 22
1-3-4 稀土元素的摻雜 ………………………………………. 23
1-4 本論文研究之動機與目的 ………………………………… 24


第二章 晶体生長 …………………………………………………26
2-1 前言 ………………………………………………………… 26
2-1-1 CZ法介紹 …………………………………………… 26
2-1-2 熱場與溫場 ……………………………………………. 30
2-2 相圖 ………………………………………………………… 33
2-3 晶体生長與加工 …………………………………………… 36
2-4 結論 ………………………………………………………… 50

第三章 晶体基本性質量測 …………………………….……… 51
3-1 前言 ……………………………………………………… 51
3-2 實驗結果與討論 ………………………………………… 52
3-2-1 穿透光譜 ……………………………………………… 52
3-2-2 X-ray粉末繞射 ……………………………………… 54
3-2-3 熱差分析(DTA) ……………………………………… 57
3-2-4 倍頻量測 ……………………………………………… 60
3-2-5 氫氧根(OH־)吸收譜 ………………………………… 64
3-3 結論 ………………………………………………………… 71

第四章 拉曼光譜研究 ……………………………………………74
4-1 前言 ………………………………………………………… 74
4-2 實驗 ………………………………………………………… 77
4-3 實驗結果與討論 …………………………………………… 78
4-4 結論 ………………………………………………………… 86

第五章 鐵電性質研究 ……………………………………………89
5-1 前言 ………………………………………………………… 89
5-2 實驗 ………………………………………………………… 94
5-3 實驗結果與討論 …………………………………………… 97
5-3-1 LN晶体之鐵電性測量 ………………………………… 97
5-3-2 Mg:LN晶体之鐵電性測量 …………………………. 102
5-3-3 Zn:LN晶体之鐵電性測量 ………………………….. 106
5-4 結論 ………………………………………………………… 119

第六章 總結論 ……………………………………………………121
參考文獻 ………………………………………………………….126
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