本研究為利用管中粉(powder-in-tube，PIT)製程之預型體，搭配光纖抽絲塔技術研製具有自發輻射螢光頻譜之單模摻鉻光纖。管中粉製程的優點在於摻鉻粉末可自行調配以提高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，但粉末狀的顆粒及粉末間的空隙，會影響纖芯真圓度及大小，所以傳輸損耗也較高。為了進一步的穩定PIT抽絲製程，提出了改良式分段抽絲製程並研製出纖芯直徑7μm，纖殼直徑為125μm的單模摻鉻光纖。其光纖傳輸損耗降至0.24dB/cm於1550nm，纖芯真圓度也提高不少。
在高溫抽絲的過程當中，石英(SiO2)擴散至纖芯的現象是無可避免，也造成自發輻射螢光頻譜衰落，為了改善Cr離子擴散現象故調整摻鉻粉末以Mg2SiO4為基材SiO2-Al2O3-K2O-MgO-TiO2-Cr2O3，其充分利用石英擴散的特性並搭配改良式分段抽絲的方式進行抽絲，得到纖芯/纖殼分別為10μm/125μm的摻鉻光纖，其自發螢光強度具有200 pW/nm的Cr4+自發輻射螢光，頻寬介於900~1400nm之間，且從Cr3+自發輻射螢光轉換成Cr4+，本研究未來目標將摻鉻光纖其螢光強度提高，使摻鉻光纖可應用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.
However, the fabrication by using powder-in-tube (PIT) with redrawing technique 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. The CDFs had a 7 μm core and a 125 μm cladding. The transmission loss was 0.27 dB/cm at 1550 nm and a core non-circularity of less than 3% for the CDFs are achieved. The fluorescence intensity of Cr3+ between 800~1200 nm was 6 nW/nm.
The optical fiber fabrication processes, whether the preform is made by MCVD(Modified Chemical Vapor Deposition), RIT(Rod-in-Tube) or PIT, the inter-diffusion between core and cladding materials is an inevitable issue at such high fiber drawing temperature. Since SiO2 is amajor component in the cladding, SiO2 will certainly diffuse into the core region and become one of the new constituents in the core. The Cr-doped powder was composed of SiO2- Al2O3-MgO-K2O-TiO2-Cr2O3 as the material of core. The CDFs had a 10 μm core and a 125 μm cladding. The fluorescence intensity of Cr4+ between 900~1300 nm was 200 pW/nm.
The CDFs were successfully fabricated by using podwer-in-tube with redrawing technique. The demonstration of CDFs makes it possible as a new generation broadband fiber amplifier and a broadband source for high resolution OCT.

中文摘要
英文摘要

內容目錄 I
圖目錄 III
表目錄
第一章 緒論 1
1.1 前言 1
1.2 文獻回顧 4
第二章 摻鉻粉末之特性 9
2.1 掺鉻粉末的選擇 9
2.2 摻鉻粉末的組成及其特性(吸收、放射、熔點) 11
2.2.1 鈣-鋁酸鹽類為主的摻鉻粉末 11
2.2.2 鋁-矽酸鹽類為主的摻鉻粉末 13
第三章 摻鉻光纖之製作 16
3.1 抽絲塔及石英材料介紹 16
3.2 摻鉻光纖之抽絲塔製程 19
3.2.1 預型體的設計 19
3.2.2 粉末燒結與預型體製作 22
3.2.3 抽絲製程 24
3.2.4 改良式分段抽絲製程 32
3.3 摻鉻光纖之熱處理 37
第四章 摻鉻光纖之光學特性量測 39
4.1 摻鉻光纖之傳輸損耗量測 39
4.2 摻鉻光纖之遠場圖案量測 43
4.3 摻鉻光纖之電子微探儀成分分析 46
4.4 摻鉻光纖之吸收頻譜量測 52
4.5 摻鉻光纖之螢光頻譜量測 54
第五章 結論與討論 59
5.1 結論 59
5.2 未來工作 61
參考文獻 63

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