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研究生: 陳冠錦
Chen, Guan-Jin
論文名稱: 利用瓶型光束泵源激發具光學渦流特性之被動式Q開關Nd:YVO4雷射
Generation of passitive Q-switch Nd:YVO4 laser with optical vortex pumped by a bottle beam
指導教授: 魏明達
Wei, Ming-Dar
學位類別: 碩士
Master
系所名稱: 理學院 - 光電科學與工程學系
Department of Photonics
論文出版年: 2021
畢業學年度: 109
語文別: 中文
論文頁數: 59
中文關鍵詞: 光學渦流 、脈衝雷射 、軸稜錐透鏡 、Q開關
外文關鍵詞: optical vortex, pulse laser, axicon, Q-switch
相關次數: 點閱:140  下載:0 
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  • 此論文利用軸稜錐透鏡搭配雙凸透鏡產生瓶型光束(bottle beam)當作泵源,使輸出雷射具有軌道角動量(orbital angular momentum),並通過改變增益晶體Nd:YVO4晶體泵浦的位置,得到帶有不同的軌道角動量的光學渦流。同時透過ABCD law計算三面鏡共振腔穩定區範圍(0≤G1G2≤1)以及共振腔中的光斑大小(Spot size),在雷射共振腔中加入Cr4+:YAG飽和吸收體當作Q開關(Q switch)來產生脈衝雷射,並且是具有光學渦流特性的脈衝雷射,藉由馬赫-曾爾德干涉儀(Mach-Zehnder interferometer)以及示波器來確認輸出雷射的拓樸股數以及脈衝物理性質,確實產生具股數為1的光學渦流脈衝雷射。

    In this thesis, we use an axicon lens with a lens to generate a bottle beam as a pump source, so that the output laser has orbital angular momentum. By changing the pump position of the gain crystal Nd:YVO4 crystal, obtain optical vortices with different orbital angular momentum. We calculate the stable range 0≤G1G2≤1 of the three-element resonant cavity and the spot size in the resonant cavity by ABCD law, and add a Cr4+:YAG saturable absorber the Q switch to generate a pulsed laser with OAM. Use a Mach-Zehnder interferometer and an oscilloscope to confirm the topological charge of the output laser and the physical properties of the pulse. Finally, we generate an optical vortex pulse laser with a topological charge of 1.

    考試合格證明 I 摘要 II ABSTRACT III 誌謝 IX 目錄 XI 表目錄 XIII 圖目錄 XIV 第1章、緒論 1 1.1 光學渦流 1 1.2 Q開關雷射 4 1.3 研究動機與目的 6 第2章、原理 7 2.1 光學渦流 7 2.2 瓶型光束 10 2.3共振腔穩定區 18 2.4 被動式Q開關 26 第3章、實驗數據與討論 34 3.1 實驗架構模型與步驟 34 3.2 瓶型光束泵源的特性 43 3.3光學渦流特性分析 45 3.4脈衝雷射之特性 48 第4章、結論與未來展望 55 4.1 結論 55 4.2 未來展望 55 第5章、參考文獻 56

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