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系統識別號 U0026-1112201615442900
論文名稱(中文) CW 976-nm 摻鐿光纖雷射之效率研究與提升
論文名稱(英文) Efficiency study and improvement of a CW Yb-doped fiber laser at 976-nm
校院名稱 成功大學
系所名稱(中) 微電子工程研究所
系所名稱(英) Institute of Microelectronics
學年度 105
學期 1
出版年 105
研究生(中文) 蘇柏維
研究生(英文) Po-Wei Su
學號 Q16031039
學位類別 碩士
語文別 中文
論文頁數 59頁
口試委員 指導教授-蔡宗祐
口試委員-李志成
口試委員-林士廷
口試委員-方彥程
中文關鍵字 摻鐿光纖  全光纖雷射  976-nm雷射  熱擴張纖核 
英文關鍵字 Yb-doped fiber  all-fiber laser  976-nm laser  TEC 
學科別分類
中文摘要 此論文是利用cladding pump的全光纖系統下,以915-nm之半導體多模雷射源作為泵浦光源來激發摻鐿光纖,產生976-nm雷射。但未經過蝕刻之摻鐿光纖無法產生976-nm之雷射,故我們利用氫氟酸配合步進馬達來蝕刻縮減摻鐿光纖直徑,提升泵浦光源的強度,進而降低雷射門檻,增加雷射效率。蝕刻後光纖損耗原因主要發生在taper region的品質,我們發現用24.5%之HF所量測之穿透率高於30% HF,原因是因為30%之HF所製作之taper region的斜率較大,使光會直射出光纖,而他的taper length也比較短,taper length越短越不利穿透率。而蝕刻後之摻鐿光纖寬度越大,976-nm之雷射增益越小,反之。故我們希望將長度14公分的摻鐿光纖直徑蝕刻至40 μm以下,並且穿透率達75%以上。我們也利用熱擴張纖核的技術來製作模態場接合器,解決共振腔中因為模態場不匹配所造成的損耗,將損耗降至最低。另外我們也分析在摻鐿光纖之前、之後、同時製作MFA對雷射輸出所造成之影響,發現同時製作MFA所得到之最高雷射輸出功率為283 mW,雷射門檻也由3.6W降低至2.8 W。
英文摘要 This thesis studies on the 915-nm Laser Diode pumped Yb-doped fiber to generate 976-nm laser which is under the double cladding pumping of the all-fiber system. Because the Yb-doped fiber is difficult to laser at 976-nm,we decreased the diameter of the Yb-doped fiber to increase the intensity of pump source. Furthermore, the higher intensity of pump source, the lower laser threshold we have. We used the step motor to etch the Yb-doped fiber and the etching solution is HF(24.5%). After several experiments, we can calculate the etching rate is 0.9 μm/minute. When we etched 100 minutes, the diameter of fiber was 36 μm and the transmission was 77.5%. The transmission loss is due to the quality of the tapering region. If the surface of taper region becomes smoother, the transmission will be higher. We also find the smaller diameter of the Yb-doped fiber, the higher gain we have in 976-nm laser. In addition, we utilized thermal expanded core technique (TEC) to make the mode-field adaptor (MFA) solve the problems of the loss due to mold-field mismatch, and reduce the loss at the resonator. We also analysed the situation that we manufacture the MFA before the Yb-doped fiber, after the Yb-doped fiber and the both side of the Yb-doped fiber. After analysing the situation, we found that when we manufacture the MFA on the both side of the Yb-doped fiber, we can measure the max output power and reduce the threshold. Finally, the highest output power we measured is 283 mW and the laser threshold is 2.8 W.
論文目次 摘要 iii
致謝 xii
表目錄 xv
圖目錄 xvi
符號 xix
第 1 章 緒論 1
1-1 前言 1
1-2 研究動機 4
第 2 章 原理 6
2-1 雷射原理 6
2-2模態競爭 8
2-3 高功率976 nm之3階雷射架構 10
2-4 全光纖系統推導與模擬 12
2-5 熱擴張纖核 19
第 3 章 蝕刻光纖之穿透率測試 21
3-1 實驗設計 21
3-1-1步進馬達之製作 24
3-2 蝕刻與測量 27
3-2-1 蝕刻 27
3-2-1 測量 29
3-3 結果與討論 32
3-4結論 35
第4章 雷射實驗 36
4-1 實驗設計 36
4-2 蝕刻與測量 38
4-1-1 增益光纖之蝕刻 38
4-1-2 增益光纖之測量 40
4-3 結果與討論 42
4-3-1 不同寬度之摻鐿光纖比較 42
4-4 結論 46
第五章 雷射優化 47
5-1實驗架構 47
5-2 熱擴張纖核與實驗方法 49
5-3熱擴張纖核之結果與討論 49
5-4 雷射系統之TEC優化 50
5-5 結論 53
第六章 總結 54
6-1成果與討論 54
6-2 未來展望 55
參考文獻 57

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