YbYAG薄片雷射與多通放大器開發研究

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姓名

高行隆(Hsin-Lung Kao) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

YbYAG薄片雷射與多通放大器開發研究
(Yb:YAG Thin Disk Laser and Multiple-pass Amplifier)

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摘要(中)

為了獲得高平均功率同調光，可藉由提升TDL架構的pump laser-TDL光轉換效率或是提高seed從MA架構獲得的增益來達成。以中山大學提供的Yb:YAG樣本作增益介質，通過自行設計的激發腔與晶體散熱系統，本論文初步建立了TDL架構與MA架構。對於TDL架構，其在共振腔長度為270 mm、輸出耦合鏡之曲率半徑與反射率分別為500 mm及95%、晶體濃度為13.3 at%時，藉由50 Hz repetition rate、duty cycle 10%，平均功率43.6 W的pump laser能夠有平均輸出功率為22.68 W，slope efficiency為61.3%，pump laser-TDL光轉換效率52%。對於MA架構，建立了二通放大器，使1040 nm、pulse energy 25.68 nJ的seed光能有1.8倍的增益，驗證了在平均功率12.4 W的pump laser，晶體能有1.55×10^21 (cm^(-3))的雷射上能階電子密度。通過二通放大結果，可推估seed laser pulse energy 2.568 μJ，其中心波長改為1030 nm且FWHM 1nm，能在趟數增加至9趟時有最大輸出能量0.5 J。

摘要(英)

To achieve high average power coherent light beam, the pump laser-TDL light transfer efficiency of a TDL system or the gain of a MA system should be enhanced. This research builds up a fundamental TDL system and a MA system, which based on the Yb:YAG samples offered by NSYSU as gain medium with self-designed pump cavity and crystal cooling system. For TDL system, this research shows that a 13.3 at.%, 300 μm Yb:YAG with a 270 mm long resonator which output coupler’s radius of curvature and reflectivity is 500 mm and 95%,respectively, pumped by a 50 Hz repetition rate,duty cycle 10%,average power 43.6 W pump laser, can deliver TDL, which average output power comes to 22.68 W and the slope efficiency is 61.3%, the pump laser-TDL light transfer efficiency is 52%. For MA system, a 2-pass amplifier is built to let a 1040 nm, pulse energy 25.68 nJ seed has a 1.8x amplification, which proves that the upper laser level density should be 1.55×10^21 (cm^(-3)) when pumped by an average power 12.4 W pump laser. By the results of 2-pass amplifier, the simulation shows a 9-pass amplifier can amplify the seed laser, which central wavelength is 1030 nm and FWHM 1 nm , pulse energy 2.568 μJ, to 0.5 J.

關鍵字(中)

★ 薄片雷射
★ 釔鋁石榴石
★ 薄片多通放大器

關鍵字(英)

★ Yb:YAG
★ Thin disk laser
★ Thin disk multiple-pass amplifier

論文目次

摘要 I
ABSTRACT II
致謝 III
目錄 IV
圖目錄 VII
表目錄 X
符號表 XI
第一章緒論 1
1.1 前言 1
1.2 文獻回顧 1
1.3 研究動機 6
1.4 論文架構 6
第二章背景知識 8
2.1 TDL與MA基礎架構 8
2.1.1 TDL基礎架構 8
2.1.2 MA基礎架構 9
2.2 Yb:YAG作為增益介質之特性 11
2.2.1 Yb:YAG的吸收與放射光譜及lifetime 11
2.2.2 Yb:YAG熱傳導係數 13
2.3 Yb:YAG TDL與MA的能量轉換 14
2.3.1 吸收與雷射上能階電子產生 14
2.3.2 TDL輸出 16
2.3.3 MA增益 16
2.4 晶體溫度分布 18
2.4.1 熱源 18
2.4.2 散熱系統的幾何與邊界條件 18
2.4.3 TD晶體表面溫度 19
2.5 熱透鏡效應 19
第三章理論模型之建立與模擬 21
3.1 Pump laser之吸收 21
3.2 晶體溫度 24
3.3 TDL輸出功率 28
3.4 MA增益 30
第四章 TDL系統與架設 37
4.1 Pump laser之光譜與輸出功率 37
4.2 激發系統架構 38
4.2.1 Pump laser至Yb:YAG晶體光學系統 38
4.2.2 Pump cavity光學設計 39
4.3 Yb:YAG晶體及其冷卻系統 41
4.3.1 Yb:YAG晶體 41
4.3.2 Yb:YAG TD的固定與散熱系統 42
4.4 雷射共振腔架構 45
4.5 Yb:YAG TD表面溫度量測與熱透鏡 46
第五章 TDL輸出結果與討論 49
5.1 Pump laser在晶體上之成像 49
5.2 晶體對pump laser之吸收 49
5.3 受共振腔條件影響之雷射行為 51
5.3.1 共振腔長度 51
5.3.2 輸出耦合鏡曲率 52
5.3.3 輸出耦合鏡之反射率 53
5.4 晶體的直徑與摻雜濃度對雷射行為之影響 55
第六章 MA系統與架設 59
6.1 晶體與激發系統 59
6.2 Seed laser 59
6.3 放大系統架構 61
第七章放大結果與討論 63
7.1 二通放大結果 63
7.2 放大器改進 65
第八章結論 67
參考文獻 68

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指導教授

鍾德元(Te-yuan Chung)

審核日期

2024-12-16

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