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研究生:洪崑貴
研究生(外文):Kun-GueiHong
論文名稱:泵源調制被動Q開關Nd:YVO4雷射的動態行為
論文名稱(外文):Dynamic behavior in the passive Q-switched Nd:YVO4 laser on pumping modulation
指導教授:魏明達
指導教授(外文):Ming-Dar Wei
學位類別:碩士
校院名稱:國立成功大學
系所名稱:光電科學與工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:45
中文關鍵詞:Q開關調制
外文關鍵詞:Q-switchedmodulation
相關次數:
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  • 下載下載:16
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本論文研究被動Q-開關Nd:YVO4雷射的非線性動態行為。隨著外加調制訊號的頻率上升,脈衝序列所表現的行為依序會出現:週期二、週期三、週期一、最後出現混亂分佈的動力學現象,有著某種路徑發展的行為,並且同時發現訊號頻率接近系統脈衝重複頻率附近時,脈衝序列抖動程度會變得非常穩定,另外此週期一之脈衝寬度與未調制比較後相對的壓縮。模擬以弦波調制泵源訊號當主軸,模擬結果的脈衝序列所有動力學現象與實驗符合。分析某些脈衝得到更強激發而使本身峰值強度更強,而某些脈衝卻因獲得不多的激發而變得更弱,所以導致形成了週期二訊號,同理週期三訊號。因此我們可知,被動式Q開關在外加訊號源的情況下可對系統產生控制或某種抑制的行為。
n this thesis, we study that the nonlinear dynamical behavior in passively Q-switched Nd:YVO4 laser. With increasing the modulation frequency of pumping source, the behavior of the pulse train in sequence will occur: period two, period three, period one and finally chaotic dynamics phenomena with some path of development. At the same time when the modulation frequency was closed to the pulse repetition frequency, the timing jitter of pulse train became very stable, and the pulse width compared with pulse train without modulation was compressed. In simulation, we modulated gain with sine wave. All the dynamic behavior of the pulse train of simulation corresponded with experiment. It’s easy to analyze that some pulses of the pulse train have stronger excitation and become the stronger peak intensity, and some pulses become weaker one because of small excitation. This phenomena lead to be period two signal. So does the period three, and so dose chaotic pulse train. The Q-switched pulse laser system can be controlled into special condition by gain-modulation with some special frequency.
目錄
摘要 I
Abstract II
誌謝 III
目錄 IV
圖目錄 VI
第一章、序論 1
1.1 Q-switched 雷射簡介 1
1.2 被動式Q開關 1
1.3 動機與目的 2
第二章、Q開關原理 5
2.1 脈衝形成 5
2.2 被動式Q開關與Cr+4:YAG工作模式 8
第三章、理論模擬與模型 11
3.1 基本模型rate equation 11
3.2 Q開關雷射速率方程式 13
3.2-1 三能階模型 14
3.2-2 參數意義與設定 16
3.3 模擬結果與討論 17
3.3-1 單一訊號源調制 18
3.3-2 雙重訊號源調制 23
第四章、實驗架構與方法分析 26
4.0 實驗初步環境 26
4.1 單調制增益控制實驗 29
4.1-1 實驗架設 29
4.1-2 實驗方法 30
4.1-3 實驗結果討論 32
4.2 雙調制實驗 38
4.2-1 實驗架設 38
4.2-2 實驗方法 39
4.2-3 實驗結果討論 39
第五章、結論與未來展望 42
5.1、結論 42
5.2、未來展望 42
文獻參考資料 44

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