相較於傳統高功率固態雷射常用的增益介質Nd:YAG，Yb:YAG量子缺陷較小，沒有激發態吸收，自發輻射生命期較長，適用於Q開關雷射。此外，Yb:YAG摻雜濃度較高，可減短增益介質的厚度，對於共振腔內光路對稱性要求高的環形共振腔而言，可以減少環形共振腔內光路的偏移量及穩定性的破壞，因此，Yb:YAG適合用在雙鏡式環形共振腔架構中。本研究已得到斜率效率為50.3%之Yb:YAG環形雷射，並且分析熱效應對Yb:YAG環形雷射輸出的影響，以及與Nd:YAG環形雷射做比較。不同雷射路徑之環形雷射極化特性也將在本文中討論到。在製程方面，將對增益介質及雷射鏡上的光學鍍膜設計做介紹。

被動式Q開關雷射的優點在於其效率高、體積小、構造簡單不需要複雜的驅動電路，並且可以應用在非線性光學、醫療、微機械加工、材料製程及精密測距等。一般而言，由於受到增益介質之自發輻射的雜訊影響，使得被動式Q開關雷射有時續擾動的問題。本研究的目的即是研製低時序擾動之被動式Q開關Yb:YAG/Cr4+:YAG環形雷射。如今，實驗結果之Q開關雷射達峰值功率208W、脈衝寬度33 ns、斜率效率18.1%、時序擾動11.9%，就目前所得文獻資料顯示，這是第一個被動式Q開關Yb:YAG/Cr4+:YAG環形雷射。

Compared with Nd:YAG, the traditional high power solid state laser gain medium, Yb:YAG has less quantum defect, no excited state absorption, and longer fluorescence lifetime, which makes it suitable for Q-switched laser. In addition, concentration quenching is absent in Yb:YAG, higher concentration of active ion makes the thickness of gain medium thinner. For ring cavities, the necessity of symmetrical beam path is important, a thinner Yb:YAG crystal can reduce the shift of optical beam path and avoids cavity unstability. Thus, Yb:YAG is suitable for the two-mirror ring cavity. In this study, a compact and efficient Yb:YAG ring laser with 50.3% slope efficiency was demonstrated. And the Yb:YAG ring laser performances influenced by thermal effect was analyzed and compared to that of Nd:YAG ring laser. The polarization of ring lasers with different configurations were also discussed. In manufacturing process, the coating design on gain medium and laser mirrors were introduced.

The advantages of passively Q-switched laser are efficient, compact, simple setup and no complicated driving circuits. They make passively Q-switched laser suitable for various applications, such as nonlinear optics, medical treatment, micromachining, material processing, and range finder. Due to spontaneous noise from the gain medium, conventional passively Q-switched laser has large timing jitter. This study is to build up a passively Q-switched Yb:YAG/Cr4+:YAG ring laser with lower timing jitter. At present, a Q-switched ring laser with a peak power of 208 W and a pulse width of 33 ns, was developed. Its slope efficiency is 18.1% with a timing jitter of 11.9%. To our knowledge, this is the first passively Q-switched Yb:YAG/Cr4+:YAG ring laser.

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 環形共振腔與Yb:YAG雷射晶體 3
2.1再入射雙鏡式環形共振腔 3
2.2 Yb:YAG雷射晶體 11
第三章 連續波Yb:YAG環形雷射 15
3.1雷射鏡與Yb:YAG晶體的光學鍍膜 15
3.2 Yb:YAG環形雷射 19
3.3 Yb:YAG環形雷射的特性 26
3.3.1雷射極化 26
3.3.2熱效應 29
第四章 被動式Q開關Yb:YAG環形雷射 33
4.1 Q開關雷射的原理及Cr4+:YAG 飽和吸收體 33
4.2實驗結果 38
4.2.1雷射效率與脈衝寬度 38
4.2.2重複頻率與時序擾動 42
4.2.3被動式Q開關Yb:YAG與Nd:YAG環形雷射成果之 46
比較
第五章 結論 48
參考文獻 50
中英對照表 53

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