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系統識別號 U0026-1507201019041100
論文名稱(中文) 兼具Q與增益被動式雙切換之全帶寬掺鐿全光纖脈衝雷射
論文名稱(英文) Full-band passively Q- and gain-switched Yb3+ all-fiber laser
校院名稱 成功大學
系所名稱(中) 微電子工程研究所碩博士班
系所名稱(英) Institute of Microelectronics
學年度 98
學期 2
出版年 99
研究生(中文) 黃懷民
研究生(英文) Huai-Min Huang
學號 q1697131
學位類別 碩士
語文別 中文
論文頁數 64頁
口試委員 指導教授-蔡宗祐
口試委員-魏明達
口試委員-崔祥辰
口試委員-鄭中緯
口試委員-黃勝廣
中文關鍵字 Q切換  脈衝雷射  全光纖   
英文關鍵字 Q-switched  pump laser  all-fiber  ytterbium 
學科別分類
中文摘要 本論文使用兼具Q與增益被動式雙切換的機制,在掺鐿的全光纖系統中製作出波長976 nm以及1064 nm脈衝雷射。主要可分為兩個部分,首先探討如何使用被動式Q切換的方式產生976 nm脈衝雷射。第二部份再利用脈衝產生後作為976 nm的可飽和吸收體即為1064 nm的增益介質,進而增益切換出1064 nm脈衝雷射,因此本論文所設計的全光纖式實驗架構可產生一個自我平衡的雙脈衝雷射系統。經過實驗證實後,在使用輸入功率110 mW的915 nm雷射二極體作為激發光源,即可產生脈衝能量為1.5 μJ、重複率2 kHz、脈衝寬度約275 ns、最高脈衝功率峰值5.45 W的976 nm雷射。並且由此實驗證實,根據鐿原子在0.97~1.12 μm的放射頻譜,只要配對上適當波長的共振腔,皆可使用兼具被動式Q切換與增益切換的機制,來產生波長範圍於0.97~1.12 μm內各個波段的脈衝雷射。
英文摘要 The purpose of the study is to produce a passively pulsed Yb3+ all-fiber laser that self-balances between being Q-switched at 0.97-0.98 μm and being gain-switched at 1-1.12 μm, using a continuous-wave 915 nm pump laser diode. The device was experimentally demonstrated at 976 nm of Q-switching, and 1064 nm of gain switching. With pump power of 110 mW, a single-mode Q-switched pulse at 976 nm with pulse energy of 1.5 μJ and pulse duration of 275 ns was achieved. Furthermore, the rate equations to simulate the interactions between the dual-wavelength photons and the populations of the ytterbium gain and absorber fibers were established. With desirable fiber Bragg gratings, a CW-pumped Yb3+ laser can produce sequential pulses in the ytterbium emission band of 0.97-1.12 μm.
論文目次 摘要 i
Abstract ii
致謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
第1章 緒論 1
1-1 前言 1
1-2 文獻探討 3
1-3 研究動機與方法 6
1-4 論文架構 8
第2章 實驗原理及模擬 9
2-1 波長976 nm脈衝雷射產生原理 9
2-1-1 鐿原子能階探討 9
2-1-2 模態場不匹配與Q切換的關係 12
2-2 雙共振腔系統 17
2-2-1 實驗架構與雙共振系統的優點 17
2-2-2 增益切換與輔助性雷射之相關理論 18
2-3 實驗模擬結果 19
2-3-1 模態場面積不匹配比值對976 nm、1064 nm脈衝的影響 22
2-3-2 改變Q切換脈衝波長 23
2-3-3 改變增益切換脈衝波長 24
2-3-4 其它與脈衝的變化相關之參數 25
第3章 掺鐿光纖的976 nm自發性脈衝雷射 28
3-1 實驗目的 28
3-2 實驗規劃及流程 30
3-2-1 激發光源的量測 32
3-2-2 共振腔內增益光纖的選擇與共振腔的反射率 33
3-3 脈衝雷射的製作 35
第4章 鐿原子全放射頻譜波段的脈衝製作 39
4-1 雙共振腔系統架設 39
4-2 實驗結果最佳化 46
4-2-1 提升模態場不匹配比值 46
4-2-2 用以保護Pump的實驗架構 49
第5章 總結與未來的展望 51
5-1 實驗總結 51
5-2 未來的展望 53
參考文獻 54
附錄A Q切換雷射Rate equation 推導 57
附錄B 增益切換雷射原理說明 61
附錄C Q切換所產生的脈衝特性分析 63
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