近來網路通訊蓬勃發展，資訊流量大增使通訊傳輸的頻寬需求增加，以及無水光纖技術突破而使光通訊用的可用頻寬拓寬1.3-1.6μm。本實驗室以雷射加熱基座生長法生長的Cr4+:YAG雙纖衣晶體光纖(double-clad crystal fiber; DCF)，採用雷射激發來產生涵蓋通訊波段(1.3-1.6μm)的自發輻射頻譜，利於發展生醫檢測光源(optical coherence tomography; OCT)、寬頻光放大器、放大自發輻射(amplified spontaneous emission)光源。

本論文使用電子槍蒸鍍系統於摻鉻釔鋁石榴石雙纖衣光纖端面蒸鍍上介電材質薄膜，使特定波段通過或反射。在改進製程參數後，能得到較高穿透率之抗反射膜層以及高反射薄膜。在光放大器的製作，將晶體光纖一端製鍍高反射膜層使訊號達到雙次傳輸，量測結果在1.4μm時薄膜厚度反射率為99.48%，1.064μm厚度穿透率則為93.77%。在雙向泵浦且雙次傳輸架構下產生訊號增益為 2.8 dB，插入損耗降為1.6 dB，系統淨增益達到 1.2 dB。

Recently, with the escalating demands for optical communications, the need for bandwidth in optical communication network has increased. The technology fiber fabrication opens the possibility for fiber bandwidth form 1.3 to 1.6μm. Cr4+:YAG double-clad crystal fiber (DCF) grown by the co-drawing laser-heated pedestal growth method has a strong spontaneous emission spectrum from 1.3 to 1.6μm. Such fiber is therefore, eminently suitable for optical coherence tomography (OCT), broadband optical amplifier, amplifier spontaneous emission (ASE) light source, and tunable solid-state laser applications.

In this thesis, multilayer dielectric thin films were directly deposited by E-gun coating onto the end faces of the Cr4+:YAG DCF. To improve thin-film quality, we can increase transmittance of laser output, and to design for the high power laser. For broadband optical amplifier in dual-pump and double-pass scheme, a 2.8-dB gross gain, a 1.6-dB insertion loss, and a 1.2-dB net gain at 1.4-μm signal wavelength have been successfully developed with HR coating onto one of the Cr4+:YAG DCF end faces.

目錄
中文摘要 i
Abstract ii
圖次 v
表次 viii
第一章緒論 1
第二章 薄膜基本理論 3
2.1光學薄膜特性和膜特徵矩陣 3
2.2光學薄膜材料之特性與光學常數分析 9
2.2.1光學薄膜材料特性 9
2.2.2薄膜光學常數分析 11
2.3膜成長理論 18
第三章 電子槍蒸鍍系統架構及量測儀器 21
3.1電子槍蒸鍍系統 21
3.1.1 真空系統 21
3.1.2電子槍系統 23
3.1.3監控系統 26
3.2晶體光纖生長架構與方法 30
3.3光學薄膜量測 36
3.3.1全光譜量測儀 36
3.3.2原子力顯微鏡 37
第四章 Cr4+:YAG雙纖衣晶體光纖光放大器之樣品製備與光學特性量測 39
4.1 Cr4+:YAG雙纖衣晶體光纖之光學特性 39
4.1.1 Cr4+:YAG晶體之結構與特性 39
4.1.2 Cr4+:YAG的能階模型與吸收及放射頻譜 43
4.2 樣品處理 47
4.2.1 光放大器樣品製備 47
4.2.2 Cr4+:YAG雙纖衣晶體光纖之散熱封裝 52
4.3 薄膜特性分析 55
第五章 光纖放大器端面鍍膜與增益量測 63
5.1 雙纖衣晶體光纖放大器之量測架構 63
5.2雙纖衣晶體光纖放大器之量測結果 66
第六章 結論與未來方向 70
參考文獻 72

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