雷射加熱基座提拉法生長摻鈰之釔鐵柘榴石晶纖

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卓于文(Yu-Wen Tso) 查詢紙本館藏

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機械工程學系

論文名稱

雷射加熱基座提拉法生長摻鈰之釔鐵柘榴石晶纖
(LHPG method grow Ce:YIG crystal fibrous)

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摘要(中)

YIG材料因具有特殊的磁光法拉第旋轉特性，故在磁光元件上的應用相當廣泛，但在現今高規格的需求下，此材料的特性已不敷使用，因此，諸多學者專家藉由摻雜各種元素來提升其性質，並發現到以摻雜鈰離子對YIG的磁光法拉第旋轉之增加最有幫助，因此，本文主要在探討以雷射加熱提拉法生長摻鈰之釔鐵柘榴石的研究。
本文內容是以靜態熔解推展到實際長晶來做探討。而從靜態熔解實驗所觀察到的熔區之各種變化情形，我們合理地推測Ce的摻雜可能會導致熔區的普朗特數上升，且震盪頻率會隨著Ce的摻雜而減緩，此外，Ce的摻雜亦會影響到熔區中下固液介面溫度梯度的下降。而在實際長晶方面，從我們所做出的實驗結果發現在本研究中鈰離子於YIG中的極限摻雜量約為x=0.2左右，此外，我們發現隨著提拉速度的降低，晶體的品質也就越好，而根據實驗的結果我們歸納出鈰摻雜量的增加，長晶時所能使用的臨界提拉速度就越低，因此，若欲獲得良好的Ce：YIG晶體就需要放慢拉速生長。

摘要(英)

Yttrium iron garnet (YIG) exhibits a large Faraday Effect in the near-infrared region, thus it has been widely applied as a magneto-optical Faraday element. With the development in technology, new materials were investigated for replacing YIG since it’s not enough magnitude of Faraday rotation to satisfy a device desired. Much research on cerium-substituted YIG had been reported with respect to the greatly larger Faraday effect than other materials. Consequently, Ce:YIG material is a much more promising material for magneto-optical devices.
In this study, we found that the influence of the addition CeO2 on the growth of YIG single crystals fibrous by LHPG method. Based on the experimental results, the addition of CeO2 into YIG caused the variation of flow properties of the molten zone, such as Prandtl number, the temperature gradient of the solid-liquid interface and the strength of oscillatory thermocapillary flow. Therefore, we have to suitability vary pulling rate to grow good quality of Ce:YIG single crystal fibrous. We see that the more Ce-doped content in YIG single crystal fibrous, the slower the pulling rate.

關鍵字(中)

★ 鈰
★ 雷射加熱基座提拉法
★ 釔鐵柘榴石

關鍵字(英)

★ LHPG
★ YIG
★ Ce

論文目次

摘要…………………………………………………………………………...Ⅰ
目錄…………………………………………………………………………...Ⅲ
表目錄………………………………………………………………………...Ⅴ
圖目錄………………………………………………………………...………Ⅵ
第一章緒論.......................................................................................................1
1.1 研究背景…………………………………………………………………..1
1.2雷射加熱提拉法…………………………………………………………....2
1.3材料簡介……………………………………………………………………3
1.4相關研究……………………………………………………………………4
1.4.1 YIG…………………………………………………………………..5
1.4.2 摻鈰之YIG…………………………………………………………8
1.5 研究動機與目的…………………………………………………………10
圖表…………………………………………………………………………...12
第二章材料製程與實驗方法……………………………………………….19
2.1 粉末的調配………………………………………………………………19
2.2 陶瓷材料棒的製作………………………………………………………20
2.3 晶纖生長…………………………………………………………………21
2.3.1 二氧化碳雷射加熱系統…………………………………………..22
2.3.2 光學轉換系統……………………………………………………..22
2.3.3長晶機台…………………………………………………………...22
2.3.4 紅外線熱影像儀…………………………………………………..22
2.3.5 靜態熔解實驗方式………………………………………………..23
2.3.6 晶纖生長方式……………………………………………………..23
2.4晶體後續檢測…………………………………………………………….24
圖表……………………………………………………...…………………....25
第三章結果與討論………………………………………………………….27
3.1 Ce：YIG陶瓷熔解實驗…………………………………………………...27
3.1.1不同鈰含量、不同雷射功率對熔區長度的影響………………….27
3.1.2不同鈰含量、不同雷射功率對熔區溫度梯度的影響…………….29
3.1.3不同鈰含量、不同雷射功率對熔區震盪週期的影響…………….30
3.1.4 靜態熔解實驗結果分析與討論…………………………………..31
3.2 摻雜氧化鈰對晶纖生長的影響…………………………………………32
3.2.1 YIG晶纖生長……………………………………………………...33
3.2.2 Ce:YIG(x=0.1)之晶纖生長………………………………………..34
3.2.3 Ce:YIG(x=0.2)之晶纖生長………………………………………..34
3.2.4 Ce:YIG(x=0.3)之晶纖生長………………………………………..35
3.2.5 討論………………………………………………………………..36
圖表…………………………………………………………………………...38
第四章結論………………………………………………………………….60
參考文獻……………………………………………………………………...62

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指導教授

陳志臣(J.C. Chen)

審核日期

2005-7-17

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