臺灣博碩士論文加值系統

　　本文主要探討如何生長大尺寸高濃度的雷射晶體─ 摻釹釔鋁石榴石({NdxY1-x}3Al5O3；Nd:YAG)。因摻雜高濃度的Nd:YAG晶體可使雷射效率提高，但摻雜的Nd3+離子大小 ( R= 1.12A )大於Y3+離子大小 ( R= 1.01A )，使YAG晶格中，較小的Y3+格位要混入較大直徑的Nd3+離子是不容易的，所以欲生長的濃度越高，難度也相對提高。
　　本實驗乃利用柴式提拉法生長雷射晶體Nd:YAG，探討不同拉晶生長條件對Nd:YAG晶體生長的影響。以改變拉晶參數、晶體的生長環境、更換熱場，來討論解決晶體生長過程中所產生的散射、開裂、螺旋生長的問題，以提高晶體的品質。
　　最後透過本實驗室所生長的Nd:YAG晶體切片樣品來進行多種光譜分析(X-ray diffraction、UV/Vis Spectroscopy、Raman Spectroscopy、PL Spectroscopy)，並與文獻結果比較，可知實驗室Nd:YAG晶體實驗所得的X-ray繞射圖、吸收光譜、拉曼光譜、螢光光譜結果皆與文獻相符。

　　This paper mainly focuses on the discussion about how to grow a large-sized highly-doped laser crystal- Neodymium yttrium aluminum garnet( {NdxY1-x}3Al5O3; Nd:YAG). The higher concentration of Nd:YAG crystal can allow the better efficiency of the laser. Since the ion size doped with Nd3+ ( R= 1.12A ) is larger than the ion size of Y3+ (R= 1.01A ), in the lattice of YAG, it’s not easy to mix the smaller Y3+ site with the larger diameter of the Nd3 + ion. Therefore, the higher concentration of the laser crystal we want to grow, the more difficult work it is.
　　This experiment works under the use of the Czochralski technique to grow the laser crystal: Nd:YAG, and explore the impacts of different crystal pulling growth conditions on the growth of Nd:YAG crystal. Through adjusting the parameters of crystal growth, the crystal growth environments and the thermal fields, I discuss how to solve the problems of the scattering, cracking and spiral growing during the crystal growth process in order to improve the quality of the crystals.
　　Finally, comparing the results of a variety of spectral analysis (X-ray diffraction, UV / Vis Spectroscopy, Raman Spectroscopy, PL Spectroscopy) on the slice samples of Nd:YAG crystal which grew by our laboratory with the literature results, we can find that the X-ray diffraction pattern, the absorption spectroscopy, the Raman spectroscopy and the Photoluminescence spectroscopy of the Nd:YAG crystals grew in this experiment are consistent with the literature.

論文審定書 i
誌謝 ii
摘要 iii
Abstract iv
目錄 vi
圖目錄 viii
表目錄 xi
第一章 前言 1
第二章 文獻回顧 2
2-1 雷射概述 2
2-1-1 雷射技術發展概述 2
2-1-2 固體雷射 2
2-2 Nd:YAG晶體介紹 5
2-2-1 Phase Diagram: Y2O3-Al2O3 System 5
2-2-2 Nd:YAG的結構及性質 9
2-3柴氏提拉法 12
第三章 晶體生長 16
3-1 晶體生長實驗 16
3-2 晶體生長結果 20
第四章 量測實驗原理&裝置 26
4-1 X光繞射分析(X-ray diffraction) 26
X光繞射基本原理 26
X光繞射分析方法 27
X光繞射儀量測參數 28
4-2紫外/可見光吸收光譜分析(UV/Vis Spectroscopy ) 29
Ultraviolet / Visible基本原理 29
UV/Vis光譜儀量測參數 29
4-3拉曼光譜分析(Raman Spectroscopy) 30
拉曼散射基本原理 30
拉曼光譜儀量測參數 31
4-4 光致螢光光譜分析(PL Spectroscopy) 32
光致螢光光譜原理 32
光致螢光光譜儀量測參數 32
第五章 結果與討論 33
5-1 X光繞射分析 (X-ray diffraction,XRD) 33
5-1-1 判斷晶相 33
5-1-2 計算晶格常數a0 42
5-2紫外/可見光吸收光譜分析 51
5-3拉曼光譜分析(Raman Spectroscopy) 56
5-4 光致螢光光譜分析(PL Spectroscopy) 60
第六章 結論 61
參考文獻 64

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