本論文為高折射率纖衣少數模態與單模態摻鉻釔鋁石榴石晶體光纖Cr4+:YAG成長之研究，並探討超寬頻Cr4+:YAG螢光特性。利用抽絲塔(Drawing-tower)技術將高折射率中空石英管棒(Schott N-SF57)抽製成內徑/外徑為40/320μm及70/260μm的中空毛細管作為纖衣，並利用雷射加熱基座生長法(Laser heated pedestal growth, LHPG)及即時監測系統將晶棒生長縮徑成直徑34μm及25μm的晶體為纖芯，接著再利用LHPG法將纖芯與纖衣加熱使緊密包覆形成少數模態及單模態摻鉻晶體光纖。模場量測在波長1.4μm的傳輸特性，同時量測螢光及增益特性。當長度為98mm、纖芯直徑為34μm的少數模態摻鉻晶體光纖在雙端激發架構下，激發之功率400mW時可獲得約4.1dB之增益(Gross gain)，但未獲得凈增益(Net gain)；而長度為67mm、纖芯直徑為25μm的單模態特性在單端激發架構下，當激發光之功率達320mW時，可獲得約2.7dB之增益，整體架構之插入損耗約2dB，淨增益為0.7dB。未來在提升晶體光纖效能工作上可以朝向精確改良提高晶棒(Source rod)與晶種(Seed rod)對準及輔以綠光即時監測以提升光纖長度及均勻度品質，提高增益以利寬頻放大器研究。

In this study, we have successfully fabricated the few-mode and the single-mode Cr4+:YAG crystal fibers with high-index cladding. The single crystal with diameter of 34μm and 25μm grown by laser-heated pedestal growth method (LHPG) are inserted into the capillary of N-SF57 high-index glass with the inner and outer diameters of 40/320 μm and 70/260 μm fabricated by fiber drawing tower. A LHPG method by CO2 laser heating was focused and shone around the capillary in order to heat it up to collapse the tightly-fitted glass capillary. In the far-field pattern measurement, the fibers with the diameter of 34μm (FMCDCCFs) are guided in few-mode, namely LP01 and LP11, and the fibers with the diameter of 25μm (SMCDCCFs) are guided in single mode, namely LP01 or HE11 mode in fiber at wavelength of 1.4μm. In the gain measurement, the Yb-doped fiber laser at wavelength of 1064nm was employed as the pump beam and a tunable laser 1400nm was the signal beam. The FMCDCCF exhibited a gross gain of 4.1 dB at the pump power about 400 mW by double pumping. The SMCDCCF exhibited a gross gain of 2.7 dB and the net gain of 0.7 dB at the pump power about 320 mW by single pumping. Further studies on higher gain, not only to reduce the transmission loss, but also to improve the device efficiency, are essential to develop the broadband fiber amplifiers.

論文審定書 i
論文公開授權書 ii
誌謝 iii
中文摘要 iv
Abstract v
目錄 vi
圖目錄 viii
表目錄 xi
第一章 緒論 1
1.1 研究背景 1
1.2 研究動機與目的 4
1.3 章節介紹 7
第二章 Cr4+:YAG晶體光纖特性 8
2.1 Cr4+:YAG晶體結構與特性 8
2.2 Cr4+:YAG晶體能階模型及吸收與放射頻譜 17
2.3 高折射率纖衣Cr4+:YAG晶體光纖信號傳輸 20
第三章 高折射率纖衣Cr4+:YAG晶體光纖製程 25
3.1 Cr4+:YAG晶體光纖生長 25
3.2 高折射率纖衣Cr4+:YAG晶體光纖研製 36
3.3 高折射率纖衣Cr4+:YAG晶體光纖端面之研磨拋光 40
第四章 高折射率纖衣Cr4+:YAG晶體光纖特性量測 45
4.1 遠場量測 45
4.2 插入損耗量測 46
4.3 螢光量測 49
4.4 增益特性量測 51
第五章 結論與討論 57
5.1 結論 57
5.2 討論 58
第六章 參考文獻 62

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