臺灣博碩士論文加值系統

近年來藍/綠光雷射在微機械加工、雷射顯示器、水下探測、高密度光儲存器及醫學診斷…等之應用發展日受重視，因此各種藍/綠光雷射技術皆被深入研究；其中半導體雷射激發之固態雷射，配合腔內倍頻技術以產生藍光及綠光雷射，是目前生命期最長且功率最高的方式。
由於綠光雷射在物理機制上為四能階雷射，而藍光雷射屬於準三能階雷射系統，使得藍光雷射在技術開發上較綠光雷射來得困難，因此如何有效產生高功率藍光雷射，並大幅縮減雷射系統架構，以期能配合產業上之應用為本實驗主要目的。此外，在開發各種高功率固態雷射過程中，若能準確地預估雷射輸出特性，如輸出功率，雷射模態…等，對於整個雷射系統的開發過程，無論在效率上或是成本上皆能產生很大助益。所以本實驗另一目的是利用一套光學軟體GLAD，來模擬分析實驗室所開發之Nd:YAG四能階與準三能階雷射系統。
實驗中我們所開發的藍光雷射共振腔就長度而言僅4mm，此外藍光輸出功率目前也可達到71.7mW。在理論模擬方面，則已經成功地運用GLAD這套光學軟體初步模擬出四能階與準三能階雷射系統，且其光轉換效率約68%左右。另外，藉由光學軟體ZEMAX，我們設計出可以有效耦合laser diode array光源之聚焦系統-lens duct，且在輸出入端面無抗反射膜下，其仍具有高達80%以上之耦合效率。

Low-cost and compact blue/green lasers are desired for applications such as micromachining, laser display, underwater communications, high-density optical data storage, and medical diagnostics recently. Therefore various type of blue and green lasers have been studied, especially for intracavity frequency doubling of the diode-pumped solid-state laser, which can generate high blue/green powers with long lifetime.
Unlike the green laser, which is originated from a four-level laser, the blue laser belongs to a quasi-three-level system, so it is more difficult to develop the blue laser source. The purpose of this experiment is to develop a high power and high efficiency blue laser with simple structure so that it can easily be commercialized. Furthermore, it is a very cost-effective approach to develop such solid-state lasers, if the laser output characteristics can be estimated precisely using software simulation. We used an optics software GLAD to model our four-level and quasi-three-level Nd:YAG laser systems.
In experiment, we developed a blue laser system with a cavity length of 4 mm and with 71.7 mW of blue output power. Besides, we have succeeded in using GLAD to model a Nd:YAG plane-parallel laser cavity, which has an optical conversion efficiency of 68%. Finally, we designed an effective lens duct with a coupling efficiency up to 80%, even if there is no AR coating on lens duct’s input or output facets.

中文摘要…………………………………..…………………………i
英文摘要…………………………………..………………………ii
目錄………………………………………….……………………iii
圖目錄…………………………………….………………………iv
表目錄……………………………………………………………vii
第一章緒論 ……………………………………………………..1
第二章藍光雷射之基本理論…………..………………………4
2-1四能階與準三能階雷射系統……….………………4
2-2Nd:YAG與Nd:YVO4雷射晶體……………………9
2-3藍光非線性晶體……………………….……………14
2-4倍頻之理論分析……………………….……………16
第三章Lens Duct及雷射系統之理論模擬……….…………26
3-1Lens Duct之工作原理…………….………………26
3-2Lens Duct之理論模擬與特性量測………………30
3-3GLAD原理………………………….………………43
3-4Nd:YAG四能階與準三能階雷射之數值分析…52
第四章高功率Nd:YAG藍光雷射……………………………57
4-1藍光雷射系統架構……………………….……………57
4-2熱導管與溫控系統之工作原理…………..……………62
4-3實驗結果與分析………………………………………65
第五章結論 ……………………………………..…………….72
參考文獻…………………………..…….………..……………74
中英對照表………………………………………………………77
附錄1四能階平行共振腔模擬程式……………..……………80
附錄2準三能階平行共振腔模擬程式…………..……………88

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