本研究為首次藉由管中棒預型體(rod-in-tube；RIT)技術，利用商用抽絲塔(drawing tower)成功製作出寬頻摻鈰光纖。以Ce3+:YAG晶體作為光纖纖芯材料及石英作為光纖纖殼材料，搭配雷射基座加熱生長法，先將長度為4cm直徑為2mm的Ce3+:YAG晶棒，縮小直徑至260μm的晶纖，再將其置入外徑7mm內徑0.3mm的多層石英套管製作為摻鈰光纖預型體，最後抽製作出纖芯直徑為13μm，纖殼直徑為125μm的摻鈰光纖，其自發輻射強度為25pW/nm。
為了解決預型體多層套管間彼此的空隙其所導致的光纖幾何結構及Ce3+:YAG成份存在於纖芯之問題，本研究進一步設計出改良式摻鈰光纖預型體，將直徑2mm長度為4cm的Ce3+:YAG晶體，放入外徑20mm內徑7mm石英管內，並搭配二氧化矽粉末填充於晶體與石英管之間作為緩衝層，抽製出纖芯直徑為25μm，纖殼直徑125μm的摻鈰光纖。
抽製出來光纖之Ce3+之螢光頻譜約展現於500-700nm處，由於其短波長及高頻寬的螢光特性，使摻鈰光纖具有作為高解析度光學斷層掃描器寬頻光源，其縱向解析度可達1.82m。另一方面，藉由藍光激發下，殘餘的藍光和激發的黃光混合能得到小尺寸的摻鈰光纖白光光源，具有發展成應用於醫療用內視鏡擁有絕佳的優勢。除此之外，本研究所開發的Ce:YAG晶體光纖雷射的潛力。

In this study, the fabrication of broadband Ce-doped fibers (CeDFs) using the fiber drawing-tower method with the rod-in-tube(RIT) technique is demonstrated.
A preform was assembled by using the Ce:YAG rod as core and the multilayer silica tubes as cladding. The outer and inner diameters of the silica tubes are 7 and 0.3mm, respectively. The initial dimension of the Ce:YAG crystal rod was a length of 4cm and a diameter of 2mm, and then grown into a diameter of 260μm with a length of 15cm by the LHPG method. The CeDFs was with a 13μm core and a 125μm cladding. The fluorescence intensity of CeDFs between 500-700nm was 25pW/nm. The transmission loss was 2.5-3.5dB/cm.
In order to improve the concentration of Ce3+-ions in the fiber core, a modified RIT perform was employed by inserting the Ce:YAG crystal rod of 4cm length and 2mm diameter into the silica tube. The gap between tubes and rod was filled with the silica powder to eliminate the gap through the high temperature process. Few meters of CeDFs with a 25μm core and a 125μm cladding had successfully been fabricated. The transmission loss had been reduced to 1-1.25dB/cm, and the fluorescence intensity was significantly improved to 40pW/nm.
For optical coherence tomography application, such a 25μm core CeDF emission represents an isotropic resolution of 1.82μm in air. The successful fabrication of CeDFs may be one step forward towards the achievement of utilizing the CeDFs as a broadband source for enabling ultrahigh resolution in optical coherence tomography. The demonstration of CeDFs makes it possible as a new broadband fiber laser and a generation core size white light source.

中文摘要
英文摘要
致謝
內容目錄 I
圖目錄 III
表目錄 Ⅶ
第一章 緒論 1
1.1 簡介 1
1.2 研究動機 2
第二章 摻鈰晶體之特性以及OCT理論介紹 5
2.1 Ce3+:YAG的晶體結構與特性 5
2.2 摻鈰晶體的能階模型與吸收及輻射頻譜 8
2.3 同調斷層掃描術 9
2.3.1 低同調干涉術 10
2.3.2 解析度 15
第三章 摻鈰光纖之製作 17
3.1 文獻探討 17
3.2 材料性質 19
3.3 抽絲塔製程之摻鈰光纖 22
3.3.1 預型體設計與製作 22
3.3.1.1 摻鈰光纖預型體 23
3.3.1.2 改良式摻鈰光纖預型體 25
3.3.2 抽絲製程 26
第四章 摻鈰光纖之特性量測 39
4.1 摻鈰光纖之傳輸損耗量測 39
4.2 摻鈰光纖之自發輻射螢光頻譜量測 43
4.3 縱向解析度 47
4.4 摻鈰光纖之EPMA成分分析 48
4.5 微結構分析 54
第五章 結果與討論 57
5.1 結論 57
5.2 討論 58
參考文獻 61

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