以體積全像布拉格光柵為反射鏡之單縱模波長可調式V型共振腔鈦藍寶石固態雷射研究

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江承燁(Cheng-yeh Chiang) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

以體積全像布拉格光柵為反射鏡之單縱模波長可調式V型共振腔鈦藍寶石固態雷射研究
(Tunable V-shaped Cavity Single Longitudinal Mode Ti:sapphire Solid-State Laser System Using Volume Bragg Grating as Laser Mirror)

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摘要(中)

本論文先說明目前常見的可調式雷射系統所應用之元件，由於其元件都必須置入共振腔中以達到調變雷射波長及模態選擇之目的，卻同時提高系統之損耗、降低輸出功率之效率，因此以一個新的光學元件--體積全像布拉格光柵(Volume Bragg Grating, VBG)，其利用滿足布拉格條件調變入射角使之對應到不同的雷射波長，同時具有波長選擇與縱模選擇的功能，取代目前使用在可調式雷射系統的元件。
本實驗設計了三個共振腔的形式，線型共振腔分別以平面鏡以及VBG作為輸出端，V型共振腔以體積全像布拉格光柵(VBG)為反射鏡，以及具有波長700 nm~1100 nm增益光譜範圍的鈦藍寶石晶體為增益介質，形成一個改變頂角大小以選擇波長機制的可調式雷射系統。
使用不同的光學儀器量測此系統下雷射光的特性，經由光譜儀證明調變範圍可由783.5 nm到741.6 nm，可調的範圍至少超過43 nm，並且由Fabry-perot 干涉儀測得在特定條件下的輸出功率下雷射輸出可維持單縱模的行為，並且光的空間模態形狀非常接近高斯光束的分佈行為。

摘要(英)

Lasers with narrow linewidth and wavelength tunability are important for spectroscopy applications. To reach such performance, several methods with different optical elements have to be introduced to the cavity designs. However, the insertion of these optical elements gives extra loss to the cavity and results in alignment complexity. A new optical element, Volume Bragg Grating (VBG), can work as a wavelength tuning and mode selection element at the same time inside the cavity to achieve desired laser performance.
This thesis demonstrated three types of laser cavity designs. Linear cavity setup used dielectric mirror and VBG as the output coupler. V-shaped cavity setup used VBG as laser folding mirror and dielectric mirror as the output coupler. Ti:sapphire crystal was chosen to be the gain medium since it has an extensively large laser tuning range from 700 nm to 1100 nm.
The V-shaped cavity setup achieved tuning range from 783.5 nm to 741.6 nm by using one single VBG which has its central reflection wavelength at 790.3 nm. Laser output performance including Fabry-Perot interference spectral measurement, laser threshold, slope efficiency, and M2 measurement were analysed in detail.

關鍵字(中)

★ 體積全像布拉格光柵
★ 鈦藍寶石
★ 可調式雷射

關鍵字(英)

★ Volume Bragg Grating
★ Ti:sapphire
★ tunable laser

論文目次

摘要 I
Abstract II
致謝 III
目錄 IV
圖目錄 VI
表目錄 VIII
第一章緒論 1
1.1 實驗動機及摘要 1
1.2 波長可調雷射 3
1.3 單縱模雷射 8
第二章實驗原理 14
2.1 雷射基本原理 14
2.1.1交互作用 14
2.1.2激發系統 15
2.1.3吸收係數與增益係數 17
2.1.4雷射閥值與輸出功率效率 19
2.2 鈦藍寶石雷射的特性 24
2.2.1物理特性 24
2.2.2光學特性 25
2.3 體積全像布拉格光柵 30
2.3.1 基本構造 32
2.3.2 角度及波長調變 34
2.4 熱透鏡效應分析 37
第三章實驗架構與理論計算 41
3.1 共振腔結構 41
3.1.1 線型共振腔 41
3.1.2 V型共振腔 44
3.2 高斯光束計算及共振腔之設計 45
附錄A 53
第四章實驗結果與討論 54
4.1 光譜波長及縱模 54
4.1.1 光譜儀 54
4.1.2 干涉儀(Fabry-Perot interference) 59
4.2 角度的調變與雷射波長 62
4.3 雷射光功率閥值及效率 64
4.4 空間模態(M2) 71
第五章結論與未來展望 73
5.1 結論 73
5.2 未來展望 74
參考文獻 76

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指導教授

鍾德元(Te-yuan Chung)

審核日期

2008-11-18

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