微型 Er:YAG 雷射之開發及優化

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姓名

喻加(Cha Yu) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

微型 Er:YAG 雷射之開發及優化
(Development and optimization of a miniature 2.94 μm Er:YAG laser)

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摘要(中)

波長 2.94 的 Er:YAG 雷射在生物及醫學上有相當多的應用，本論文是要開發出攜帶型的 Er:YAG 雷射採血機的原型，並且將它優化。為做到縮小體積和提昇效率，我們利用文獻中的理論模型和光譜參數，運用數值方法來進行設計及優化。我們用數值模擬，分析了為量子效率大於一的現象和雷射脈衝延續到泵激脈衝之後的現象，也討論光譜參數的不準確對模擬的結果造成之影響。
為提高數值模擬的準確度，必須找到雷射共振腔內的被動損耗，但由於 Er:YAG 不是理想的四能階雷射，傳統找損耗的方法在理論上是無法正確的量測出被動損耗。對此現象，本論文提出了一個數值模擬的結果，其中說明了傳統方法的可行性，進而量測出我們實作出來的 Er:YAG 雷射的被動損耗，同時也只用了四種輸出耦合鏡的反射率，就找到各種雷射輸出能量下的輸出耦合鏡反射率之最佳值。

摘要(英)

The principal objective of this thesis is to develop a miniature Er:YAG laser, and to collect blood with it. The performance of a flashlamp pumped miniature 2.94 ?m Er:YAG laser is optimized by using a mathematical model. The model is based on the rate equations with spectroscopic data including energy transfer processes. Using this model, we can explain the phenomenon of great-than-unity quantum efficiency and the experimental phenomenon that the laser pulse slightly extends beyond the pumping pulse in some cases. We found passive loss of our laser system. A method of optimizing the reflectivity of the output coupler was also presented.

關鍵字(中)

★ 固態雷射
★ 採血

關鍵字(英)

★ solid state laser
★ Er:YAG
★ blood sampling

論文目次

中文摘要 ................................................................I
英文摘要 ...............................................................II
誌謝 ..................................................................III
目錄....................................................................IV
圖目錄..................................................................VI
表目錄................................................................VIII
第一章序論 1
1.1. 研究背景與動機 1
1.2. 文獻探討 3
第二章理論架構及雷射特性 5
2.1. 速率方程式 5
2.2. 各參數的變異所造成的影響 10
2.3. 能量回收機制 14
2.3.1. 大於一的量子效率 14
2.3.2. 時間上的特性 15
第三章實驗架設 19
3.1. 實驗架設—電的部份 19
3.1.1. 高電壓電源供應器 20
3.1.2. 閃光燈 20
3.1.3. 脈衝產生電路的設計理論 21
3.1.4. 閃光燈的脈衝長度及其壽命 23
3.1.5. 觸發電路 27
3.2. 實驗架設—光的部份 29
3.2.1. 泵激腔 29
3.2.2. 雷射共振腔 31
第四章實驗結果及優化 34
4.1. 實驗結果 34
4.2. 被動損耗 37
4.2.1. 找出理想的四能階雷射的被動損耗的方法 37
4.2.2. Er:YAG雷射的被動損耗 39
4.3. 最佳反射率 41
第五章結論 43
參考文獻................................................................44
附錄：符號說明..........................................................48

參考文獻

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[32] http://www.kigre.com/files/reflector.pdf

指導教授

游漢輝、董玉平
(Hon-Fai Yau、Yuh-Ping Tong)

審核日期

2008-5-5

推文