本研究發現光纖抽製的過程中石英管(SiO2 )與摻鉻玻璃介面的擴散影響玻璃的螢光特性，主要是因為 Si4+
取代 Cr4+四面體的位置，造成螢光衰減且晶場強度降低。本研究選擇以 SiO2 為主的玻璃組成: Mg2SiO4 glass ceramics ，再減少其 SiO2 的含量經過燒結成陶瓷粉。本研究選擇利用石英(SiO2 )擴散的特性，石英的擴散提供部分的 SiO2，原先的陶瓷粉與石英擴散形成玻璃的形態 (MgO-SiO2 glass)，形成的玻璃經過熱處理後螢光與晶場的特性獲得改善。經過擴散的玻璃 Cr4+
螢光中心波長約~1100nm 屬於 Cr4+ :Mg2SiO4 晶體螢光的螢光。本研究提供了新式的光纖製程也成功降低介面擴散的影響。
本研究也提供新式的熱處理:Laser induced crystallization，雷射熱處理可以快速形成晶體，傳統的熱處理方式需要數小時，但雷射熱處理只需要數秒鐘。本研究也發現只經過一步驟熱處理的結晶大小約 20μm，假如使用兩步驟雷射熱處理的結晶大小可以降低至200nm，雷射熱處理成功誘發玻璃產生奈米晶體在數秒鐘以內。

This study indicate that the chemical inter-diffusion between the Cr-doped glass/glass ceramic and quartz (SiO2) influence the fluorescence properties of glass, mainly because of Cr4+ replacing by tetrahedral of Si4+. Cr4+ fluorescence intensity was reduced and its emission band was shifted to longer wavelength (red shift). We selected the SiO2-based glass composition: Mg2SiO4 glass-ceramic and reduced a ratio of SiO2 sintered into the ceramic powder. This paper used diffusion characteristics of quartz (SiO2) to compensate for reduced SiO2 in the ceramic powder. After diffusing with quartz (SiO2), ceramics powder changed into glasses. The intensity of fluorescence and the crystal field had been improved. The center of Cr4+ fluorescence is about 1100nm belonging to Cr4+:Mg2SiO4 crystal. The ratio of Cr4+ in Mg2SiO4 crystal/Cr4+ in MgO-SiO2 glass increases from 0.33 to 1.74. The goal is to develop a novel glass which is resistant to SiO2 inter-diffusion degradation during fiber fabrication, and provide the new fiber technology to avoid the influence of inter-diffusion
This study provides new types of treatment: Laser induced crystallization. Laser heat-treatment can more quickly induce crystals in glass during seconds, than traditional heat-treatment which require several hours. This study also indicate that one step laser heat-treatment induce micro-crystals, but one step laser heat-treatment induce nano-crystals. We successfully produced nano-crystallization during seconds.

論文審定書 i
誌謝 iii
中文摘要 iv
Abstract v
圖目錄 ix
表目錄 xii
第一章 緒論 1
第二章 摻鉻玻璃與玻璃陶瓷特性 4
2.1 摻鉻玻璃: 4
2.1.1摻鉻玻璃吸收與螢光光譜: 4
2.1.2摻鉻玻璃量子效率(Quantum efficiency): 6
2.2 摻鉻玻璃陶瓷: 8
2.3 配位場與能階模型: 11
2.3.1 摻鉻玻璃能階模型: 12
2.3.2 摻鉻玻璃陶瓷能階模型: 13
2.3.3橄欖石晶體結構: 14
第三章 實驗步驟 16
3.1摻鉻玻璃與玻璃陶瓷製程: 16
3.2 摻鉻玻璃與玻璃陶瓷與二氧化矽擴散實驗: 17
3.2.1二氧化矽-玻璃與玻璃陶瓷燒結: 18
3.2.2 二氧化矽-陶瓷粉燒結: 18
3.3 摻鉻玻璃與玻璃陶瓷量測: 19
第四章 實驗結果與討論 23
4.1研製摻鉻玻璃與玻璃陶瓷特性: 23
4.1.1吸收與螢光頻譜: 23
4.1.2配位場分析: 27
4.1.3玻璃陶瓷螢光分析: 31
4.2二氧化矽擴散影響與改善: 34
4.2.1二氧化矽-摻鉻玻璃與玻璃陶瓷: 34
4.2.2二氧化矽-摻鉻陶瓷粉: 37
第五章 雷射誘發玻璃陶瓷結晶 42
5.1雷射熱處理: 42
5.2二氧化碳雷射熱處理實驗: 43
5.3雷射熱處理結果與討論: 44
5.3.1 雷射誘發晶體尺寸與螢光特性 44
5.3.2 雷射誘發晶體時間與功率關係 45
第六章 結論 48
參考文獻 50

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