臺灣博碩士論文加值系統

在共振腔內擺入飽和吸收體Cr4+ : YAG晶體可得高功率雷射脈衝輸出，而高功率雷射可應用在遠距離量測、雷達、醫療以及材料加工等方面。進一步藉由腔長的改變，而雷射脈衝寬度由奈杪( ns )等級的Q開關雷射脈衝轉變為皮秒( ps )等級的鎖模雷射脈衝輸出，且雷射脈衝輸出功率由72 kW提升至300 kW左右。本論文中建立了一套完整的理論模型來解釋Q開關且鎖模雷射，經由本理論模型計算所得脈衝輸出能量及波形(對時間而言)皆與實驗結果相當吻合，且理論模型中提供了簡單的參數以便於共振腔架構之設計。

We can obtain high peak power laser with absorber inside cavity. High peak power lasers are applied to distance measuring, radar, medical system and industry marker process. Increasing the length of cavity leads to narrower pulsewidth and higher peak power of pulse laser. A general recurrence is derived for the analysis of temporal shape of a single Q-switch envelope with mode-locked pulse trains. With the developed model, the mode-locked pulse and Q-switch pulse energy can be calculated. Excellent agreement was found between the present results and detailed theoretical computations.

中文摘要 ………………………………………………………… i
英文摘要 ………………………………………………………… ii
誌謝 ………………………………………………………… iii
目錄 ………………………………………………………… iv
圖表目錄 ………………………………………………………… vi
第一章 簡介…………………………………………………… 1
1.1 研究動機……………………………………………… 1
1.2 本論文組織…………………………………………… 1
第二章 Q開關雷射動作機制及原理………………………… 2
2.1 導論…………………………………………………… 2
2.2 Q開關雷射動作機制及原理………………………… 2
2.3 被動式Q開關之飽和吸收體………………………… 4
第三章 Q開關雷射實驗架構及理論模型…………………… 5
3.1 實驗架構……………………………………………… 5
3.2 Q開關雷射理論模型及實驗結果…………………… 7
3.2.1 理論模型……………………………………………… 7
3.2.2 實驗結果及理論比較………………………………… 11
第四章 鎖模雷射的動作與機制……………………………… 20
4.1 導論…………………………………………………… 20
4.2 鎖模技術分類………………………………………… 20
4.2.1 飽和吸收體Cr4+:YAG的鎖模機制…………………… 20
4.3 縱模間的耦合（mode coupling）…………………… 21
4.4 擾動理論（Fluctuation）…………………………… 25
4.4.1 導論…………………………………………………… 25
4.4.2 擾動理基本架構……………………………………… 25
4.4.3 腔內光訊號放大及篩選過程………………………… 29
第五章 Q開關且鎖模雷射之實驗架構與理論模型………… 44
5.1 導論…………………………………………………… 44
5.2 實驗架構……………………………………………… 44
5.2.1 50公分腔長…………………………………………… 44
5.2.2 100公分腔長 ………………………………………… 45
5.3 Q開關且鎖模雷射之理論模型 ……………………… 45
5.4 實驗結果與理論分析比較…………………………… 49
5.4.1 輸出脈衝之能量及功率比較………………………… 49
5.4.2 R及To參數對鎖模好壞程度之影響……………… 50
5.4.3 腔長對鎖模好壞程度之影響………………………… 51
5.4.4 雷射鎖模程之模擬…………………………………… 52
5.5 結論…………………………………………………… 57
第六章 結論與未來展望……………………………………… 88
參考文獻 ………………………………………………………… 89

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