本研究之目的在開發出具有高功率、短波長、體積小等優點的固態藍光雷射，可應用在微機械加工、雷射雷達、水下探測、生化科技等方面。藉由成本低、體積小且使用簡單的被動式Q開關技術，以有效提高雷射的峰值功率，並整合能以非線性頻率轉換產生藍光雷射且符合經濟效益的腔內倍頻技術。

我們從Nd:YVO4實驗結果中，發現因為熱效應而產生的重複吸收損耗再加上對1064 nm抑制不夠，造成四能階1064 nm出光，而不是準三能階914 nm出光。因此我們改變增益介質，使用散熱較佳的Nd:YAG晶體，並且增加對1064 nm的抑制後，成功研發出用3 W幫浦Nd:YAG晶體，產生峰值功率為114 W的473 nm準三能階藍光雷射。

理論方面由於文獻尚未有準三能階被動式Q開關雷射的模擬，因此我們修改現有四能階Q開關雷射模型，加入下能階重複吸收損耗的影響，求得準三能階被動式Q開關雷射的速率方程式，而我們使用數值分析中的有限時域差分法來解析準三能階被動式Q開關雷射的速率方程式，並且模擬重複吸收損耗對雷射系統的影響，希望藉此掌握各個影響雷射性能的重要參數，最佳化雷射的輸出。

The purpose of this thesis is to develop a high power, compact all solid-state blue laser, which is applicable in micro machining, LIDA, underwater ranging, biochemical techniques and so forth. The passive Q-switching technique, which is known to be a low-cost and simple method to raise the laser peak power was employed in this thesis. In the mean time, the intracavity-doubling technique was integrated to achieve the non-linear frequency conversion for generating blue laser at low cost.

Based on our research finding, the reabsorption loss due to thermal effect and a paucity of suppression at wavelength of 1064 nm on laser mirrors could cause the four-level oscillation at 1064 nm instead of three-level oscillation at 914nm. Improvement in heat dissipating system, and suppression at wavelength of 1064 nm on mirror coating has led to a success in developing a quasi-three-level blue laser with peak power of 114W at wavelength 473 nm.

A modified rate equation model of the quasi-three level passively Q-switched blue lasers was developed as well, in which the influence of the re-absorption loss in the gain medium and its intracavity frequency doubling were both considered. The influence of reabsorption loss upon the laser power deduction was studied by numerical simulation in order to optimize the laser performance.

中文摘要 i
英文摘要 ii
圖目錄 iv
表目錄 vii
第一章 緒論 1
第二章 藍光雷射的基本原理 3
2.1 準三能階與四能階雷射系統 3
2.2 Nd:YAG與Nd:YVO4雷射晶體 5
2.3 腔內倍頻的探討 10
2.4 Q開關的探討 20
第三章 準三能階連續波Nd:YVO4雷射 26
3.1 實驗架構與結果分析 26
3.2 準三能階Nd:YVO4的討論 36
第四章 準三能階被動式Q開關Nd:YAG藍光雷射 38
4.1準三能階被動式Q開關IR雷射 38
4.1-1 IR雷射理論模型 38
4.1-2實驗架構與IR結果和模擬比較 44
4.2準三能階被動式Q開關藍光雷射 48
4.2-1藍光雷射理論模型 49
4.2-2實驗架構與藍光結果和模擬比較 51
第五章結論 63
參考文獻 65
中英對照 67
附錄：模擬程式 70

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