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研究生:吳建明
論文名稱:光頻梳雷射系統與銫原子6S-8S雙光子躍遷光譜
論文名稱(外文):Optical frequency comb laser system and Cesium 6S-8S two-photon transition spectroscopy
指導教授:李瑞光李瑞光引用關係鄭王曜
學位類別:博士
校院名稱:國立清華大學
系所名稱:光電工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2014
畢業學年度:102
語文別:中文
論文頁數:124
中文關鍵詞:光頻梳雷射半導體雷射銫原子雙光子躍遷絕對頻率穩頻雷射
相關次數:
  • 被引用被引用:2
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  • 下載下載:22
  • 收藏至我的研究室書目清單書目收藏:0
銫原子6S-8S雙光子躍遷是個相當優質的譜線,它不受一階磁場效應的干擾,也可以很輕易的消除一階都卜勒效應。在研究價值上,它可以用來驗證與研究相當多的物理定律,如宇稱不守恆與夸克質量是否會改變等。在應用方面,它有潛力成為一個可靠且輕巧的光頻率標準源。
本篇論文建立了穩頻半導體雷射系統與光頻梳雷射系統來研究此躍遷,透過一個電光調制器我們同時達成了鎖頻兼掃頻的任務,在Pound-Drever- Hall的技術下我們縮減了雷射線寬而一步一步描繪出高解析的光譜,透過函數擬合光譜訊號以及以銫原子鐘為基準的光頻梳雷射測量掃頻雷射的頻率,我們得出5 kHz量測不準度的躍遷頻率中心值,但是我們的量測結果與德國Max Planck研究所的Hänsch團隊有著4σ的差異。為了找出這個差異的原因,我們檢驗了10支實驗室裡的銫原子氣室之躍遷絕對頻率,其中有些氣室來自不同的製造公司,修正了已知的頻率偏移效應後,我們發現這些氣室所量測到的躍遷絕對頻率可以差距到400 kHz,而且絕對頻率的差距與螢光線寬有高度正相關性。我們最終選取兩個線寬最窄也最接近理論計算的氣室,以其量測值的平均來決定出躍遷絕對頻率,並且將不準度保守評估為10 kHz。這個成果發表在2013年的Optics Letters期刊上,並且獲得美國光學學會選為8月份的Spotlight on Optics。
此外,我們藉著調制雷射相位,進行了雙光子躍遷量子干涉的觀測。我們觀察到原本單純的雙光子光譜出現了許多新的光譜訊號,這些訊號不僅強度隨著調制深度而有變化外還伴隨著干涉的效應,因此在適當的條件下,即使載波的雷射頻率仍存在,但螢光訊號卻幾乎消失,證實了破壞性量子干涉的存在。

誌謝 i
摘要 ii
ABSTRACT iii
目錄 iv
圖目錄 vii
表格目錄 xi
Chapter 1 簡介 1
1.1 研究動機 1
1.2 穩頻雷射與頻率標準 2
1.3 光頻測量與光頻梳雷射的發明 3
1.4 銫原子6S-8S雙光子躍遷重要歷史文獻 6
1.5 本論文的導覽 8
Chapter 2 銫原子與雙光子躍遷原理 10
2.1 銫原子的性質與能階介紹 10
2.1.1 銫原子的性質 10
2.1.2 超精細結構 11
2.1.3 銫原子6S-8S雙光子躍遷 12
2.2 Doppler-free雙光子躍遷理論 13
2.2.1 雙光子譜線增寬效應 14
2.2.2 頻率偏移 16
2.3 雙光子躍遷干涉 20
Chapter 3 半導體穩頻雷射系統 25
3.1 半導體雷射簡介 25
3.2 外腔式半導體雷射 31
3.3 共振腔與Pound-Drever-Hall穩頻法 36
3.3.1 自製共振腔 37
3.3.2 PDH穩頻法 39
3.3.3 半導體雷射鎖頻數據分析 45
Chapter 4 光頻梳雷射系統與光頻率量測 49
4.1 鎖模脈衝雷射 49
4.2 鈦藍寶石鎖模雷射實驗架設 56
4.3 光頻梳雷射系統 63
4.4 雷射頻率量測 68
4.5 光頻梳雷射實驗數據分析 74
4.5.1 光頻梳雷射運作性質 74
4.5.2 光頻梳雷射鎖頻分析 75
Chapter 5 雙光子光譜實驗與絕對頻率量測 81
5.1 干涉光譜實驗 81
5.1.1 螢光強度隨調制深度的改變 82
5.1.2 頻率調制與調制偏移 85
5.2 雙光子高解析光譜實驗 88
5.2.1 實驗架設 88
5.2.2 光譜訊號與函數擬合 92
5.2.3 譜線增寬分析 98
5.2.4 躍遷頻率偏移數據 100
5.3 雙光子躍遷絕對頻率量測 104
5.4 絕對頻率數據之比較 108
Chapter 6 總結 112
6.1 總結與討論 112
6.2 未來工作與應用 114
6.2.1 可攜式光頻梳雷射 114
6.2.2 多重外差光梳光譜 115
參考資料: 118

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