本研究為首次利用管中粉(powder-in-tube，PIT)預型體，搭配光纖抽絲塔(drawing tower)技術研製具有自發輻射螢光頻譜之摻鉻光纖(Cr-doped fiber)。
利用管中棒預型體所抽出之掺鉻光纖，因為其纖芯材料Cr:YAG晶棒的鉻離子濃度經過高溫抽絲製程後，濃度降低，不足以產生足夠的激發螢光。使用摻鉻粉末(Cr-doped powder)的優點在於可以自行調配並提高Cr離子的濃度，藉由掺鉻粉末CaO-Al2O3-BaCO3-MgO-Cr2O3作為光纖纖芯的材料及搭配石英管作為光纖纖殼材料來製作掺鉻光纖，研製出纖芯直徑17.5 μm，纖殼直徑為125 μm的摻鉻光纖。其光纖傳輸損耗為0.74 dB/cm@1550nm，自發輻射螢光頻譜在800~1200nm有50nW/nm強度。
進一步使用多層套管的方式有效降低了纖芯的大小，成功抽出直徑為5 μm的摻鉻光纖，由遠場圖案確定其在波長1260 nm以上即具有單模傳輸的特性，光纖損耗降至0.135 dB/cm@1550 nm。
利用抽絲塔研製摻鉻光纖的優點在於容易控制纖芯的直徑，且光纖大小均一，易與通訊用單模光纖熔接，及寬頻通訊系統的分波多工耦合器耦合。由於寬頻螢光特性，使摻鉻光纖具有潛力發展為寬頻光纖放大器及高解析度光學斷層掃描器之寬頻光源。

The success in fabrication of Cr-doped fibers (CDFs) with fluorescence of Cr3+ by powder-in-tube (PIT) method equipped with drawing-tower process is demonstrated for the first time.
The fluorescence intensity of CDFs by fabricated RIT method is weak because the concentration of Cr-ion in Cr:YAG rod is low. However, the fabrication with powder-in-tube (PIT) provides a better solution to improve the concentration of Cr-ion to enhance the fluorescence of CDFs. The Cr-doped powder was composed of CaO-Al2O3-BaCO3-MgO-Cr2O3 as the material of core and then it was poured into the silica tube with outer diameter of 20 mm and inner diameter of 7 mm (20/7) to yield the perform. The CDFs had a 17.5 μm core and a 125 μm cladding. The transmission loss was 0.74 dB/cm at 1550 nm. And the fluorescence intensity of Cr3+ between 800~1200 nm was 50 nW/nm.
To reduce transmission loss further, we used multi-tubes to raise the ratio of cladding to core. According to the principle of conservation of mass, the core diameter of CDFs was 5 μm. The transmission loss was improved more than 50% and it reached to 0.135 dB/cm at 1550 nm. Moreover, a single-mode characteristic of CDF was observed when the propagation wavelengths were longer than 1260 nm.
The CDFs were successfully fabricated by using a fiber drawing-tower technique with PIT method. The demonstration of CDFs makes it possible as a new generation broadband fiber amplifier, a tunable NIR fiber laser for sensor applications, and a broadband source for high resolution OCT.

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 前言 1
1.2 文獻回顧 8
第二章 摻鉻粉末之特性 12
2.1 掺鉻粉末的選擇 12
2.2 摻鉻粉末的組成及其吸收和放射頻譜14
第三章 摻鉻光纖之製作 17
3.1 抽絲塔及石英材料的介紹 17
3.2 抽絲塔製程之摻鉻光纖 20
3.2.1 預型體的設計與製作 20
3.2.2 摻鉻粉末燒結 24
3.2.3 抽絲製程及參數 27
第四章 摻鉻光纖之光學特性量測 38
4.1 摻鉻光纖之折射率量測 38
4.2 摻鉻光纖之遠場圖案量測 41
4.3 摻鉻光纖之傳輸損耗量測 45
4.4 摻鉻光纖之自發輻射螢光頻譜 49
4.5 摻鉻光纖之EPMA成分分析 53
第五章 結論與討論 61
5.1 結論 61
5.2 討論 62
參考文獻 65

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