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系統識別號 U0026-0812200914150646
論文名稱(中文) 銫原子6S-8S雙光子躍遷中的電磁誘發透明
論文名稱(英文) Electomagnetically induced transparency of Cs 6S-8S two-photon transition
校院名稱 成功大學
系所名稱(中) 物理學系碩博士班
系所名稱(英) Department of Physics
學年度 96
學期 2
出版年 97
研究生(中文) 陳英昱
研究生(英文) Ying-yu Chen
電子信箱 l2695105@mail.ncku.edu.tw
學號 l2695105
學位類別 碩士
語文別 中文
論文頁數 61頁
口試委員 指導教授-蔡錦俊
口試委員-陳泳帆
召集委員-韓殿君
中文關鍵字 強度增寬  雙光子躍遷  銫原子  碰撞增寬  電磁誘發透明  光偏移  碰撞偏  銫原子6S-8S 雙光子躍遷中的電磁誘發透明 
英文關鍵字 Cesium  two-photon transition  power broadening  pressure broadening  electrically induced transparency  EIT  light shift  pressure shift 
學科別分類
中文摘要 我們利用銫原子雙光子躍遷光譜實驗研究雙光子躍遷的自然線寬(nature line width),強度增寬(power broadening)及碰撞增寬(pressure broadening)及光位移(Light shift)和壓力位移(Pressure shift);另外,我們引入一道 |6S1/2 F=4>→|6P3/2 F=5> 共振頻率的雷射光來觀測V-形式的雙光子躍遷電磁誘發透明現象,並成功觀察到雙光子螢光光譜(7P-6S)的凹陷結果。第一部分的實驗是將一道Ti:sapphire雷射分成兩道,分別導入一個主要和一個參考的加熱溫控的銫原子氣室再直接反射回原光路,兩氣室都利用自製的加熱與溫控系統將其溫度控制在550.2˚C。藉由偵測銫原子7P-6S的紫色螢光,我們可以得到銫原子6S-8S雙光子躍遷光譜,利用參考氣室,我們測得雙光子躍遷之光偏移(light shift)約為-8.6036 Hz/(mW/mm2)及碰撞偏移(pressure shift) -552.9 Hz/mPa。將觀測之譜線以Voigt 分佈做擬合,其中屬於銫原子的8S自然線寬(Lorentzian width)約為1.540.09 MHz。在V-形式的雙光子躍遷電磁誘發透明中,我們利用兩個Lorentzian Profiles來擬合雙光子螢光光譜(7P-6S)的凹陷光譜,得到凹陷位置與雷射功率的關係為24.528 KHz/(mW/mm2)。
英文摘要 In Cesium 6S-8P two-photon transition, we measured the line width (including nature line width, power broadening, and pressure broadening) and light shift and pressure shift. With the |6S1/2 F=4>→|6P3/2 F=5> on resonance laser light overlapped with the two-photon transition, we studied the V-type electromagnetically-induced transparency in cesium two-photon transition and observed a transparency dip on the fluorescence spectrum of two-photon transition(7P-6S). In the first part of experiment, a cw tunable Ti:sapphire laser was split into two beam and directed into two temperature stabilized cesium cells (main and reference cells). The temperature of both cell are heated and stabilized at 500.2˚C by using home-made temperature controllers. We measured the Cs 6S-8S two-photon transition by detecting the cascaded violet 7P-6S fluorescence. Comparing the spectra between the main and reference cells, we obtained the light shift is about -6.5836 Hz/(mW/mm2) and pressure shift is about -552.9 Hz/mPa. Fitting the observed spectrum with a Voigt profile, the nature linewidth (Lorentzian width) of Cs 8S is 1.540.09 MHz. In the V-type electromagnetically-induced transparency of cesium two-photon transition, the observed a transparency dip was fitted with two Lorentzian profiles (absorption and transparency). The separation of these two peaks was measured as a function of the intensity of laser and is about 24.528 KHz/(mW/mm2).
論文目次 摘要............................................................................................................................... 3
ABSTRACT.................................................................................................................. 4
致謝............................................................................................................................... 5
目錄............................................................................................................................... 6
圖目錄........................................................................................................................... 8
第1 章 緒論................................................................................................................11
1.1 研究目的......................................................................................................11
1.2 雙光子躍遷研究的歷史..............................................................................11
第2 章 基本理論....................................................................................................... 12
2.1 銫原子及銫原子超精細結構..................................................................... 12
2.1-1 銫原子簡介.................................................................................... 12
2.1-2 銫原子超精細結構........................................................................ 12
2.2 都卜勒效應及無都卜勒增寬之雙光子躍遷............................................. 13
2.3 無都卜勒增寬之雙光子躍遷線形及譜線增寬......................................... 14
2.4 光偏移(Light shift 或AC Stark Effect) .................................................... 17
2.5 電磁誘發透明現象..................................................................................... 19
第3 章 實驗儀器及架設........................................................................................... 22
3.1 雷射系統..................................................................................................... 22
3.2 光電倍增管及高電壓電源供應器............................................................. 22
3.3 鎖相放大器................................................................................................. 23
3.4 擷取訊號(autoscan & internal scan) .......................................................... 23
3.4-1 Auto scan ......................................................................................... 23
3.4-2 Internal scan .................................................................................... 24
3.5 螢光訊號收光系統架設及測試................................................................. 25
3.6 雙光子躍遷光譜實驗架設流程................................................................. 27
3.7 雙光子躍遷之光偏移及碰撞偏移實驗架設流程..................................... 28
3.8 雙光子躍遷中的電磁誘發透明實驗架設流程......................................... 29
第4 章 實驗結果及分析........................................................................................... 31
4.1 雙光子躍遷光譜......................................................................................... 31
4.2 訊噪比......................................................................................................... 31
4.3 雙光子躍遷光譜的線寬及譜線增寬......................................................... 32
4.3-1 強度增寬(Power broadening) ........................................................ 33
4.3-2 碰撞增寬(Pressure broadening) 40mW......................................... 35
4.4 光偏移(light shift) ...................................................................................... 37
4.5 碰撞偏移(Pressure shift) ............................................................................ 39
4.6 雙光子躍遷中的電磁誘發透明光譜......................................................... 41
第5 章 結論............................................................................................................... 47
第6 章 附錄............................................................................................................... 48
6.1 銫原子氣室之氣壓控制............................................................................. 48
6.2 控溫系統及溫控器電路設計原理............................................................. 49
6.2-1 溫控器電路設................................................................................ 49
6.2-2 控溫系統........................................................................................ 52
6.2-3 溫控系光的穩定度測試................................................................ 52
6.3 雷射光點腰身之量測................................................................................. 54
6.3-1 針孔掃描法.................................................................................... 54
6.3-2 光束測量儀.................................................................................... 55
6.4 實驗數據附表............................................................................................. 57
參考文獻..................................................................................................................... 60
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