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研究生： 陳亭儒
CHEN, TING-JU
論文名稱： 銫原子6S1/2-6D3/2超精細躍遷絕對頻率與超精細結構
Cesium 6S1/2-6D3/2 hyperfine transitions : absolute frequency and hyperfine structure
指導教授： 鄭王曜
Cheng, Wang-Yau
口試委員:
學位類別： 碩士
Master
系所名稱： 理學院 - 物理學系
Department of Physics
論文出版年： 2017
畢業學年度： 105
語文別： 中文
論文頁數： 61
中文關鍵詞： 銫原子 、6S-6D 、超精細結構 、雙光子躍遷
外文關鍵詞： Cesium, 6S-6D, hyperfine structure, two-photon transition
相關次數： 點閱：11  下載：0 
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    • 我們建立了一套885 nm穩頻雷射系統，藉由電光調製器將一外腔式半導體雷射頻率鎖在銫原子6S1/2-6D3/2的交叉譜線躍遷上，穩定度在200秒平均時間為10-12 (受限於銫原子鐘的穩定度)。我們使用偏頻鎖頻技術控制另外一台外腔式半導體雷射，透過Doppler free雙光子躍遷光譜測量銫原子6S1/2-6D3/2的躍遷頻率。經過對light shift以及磁場的修正，推得超精細常數為A=16.3351(8) MHz B=-0.092(9) MHz C=0.0029(4) MHz。除此之外，考慮了殘餘氣體對銫原子能階可能的影響，我們在真空系統中量測銫原子6S1/2-6D3/2¬躍遷的絕對頻率，其值分別為6S1/2 F=4 - 6D3/2 F=5: 338 595 897 162 (51) kHz 以及6S1/2 F=3 - 6D3/2 F=5: 338 600 493 491 (15) kHz

    We developed an 885-nm frequency stabilized laser system locked via Cesium 6S1/2-6D3/2 crossover-line transition with electro-optical modulator. The stability of laser frequency is 10-12 at 200-seconds average time. We offset locked a slave laser to probe the hyperfine structure of Cesium 6D3/2 via the Doppler free two-photon transition spectra. After extrapolating the light shift and the Zeeman shift, the Cesium 6D3/2 coupling constants A and B and C are determined as A=16.3351(8) MHz; B=-0.092(9) MHz; C=0.0029(4) MHz, which is the first time to our knowledge pushing the spectral resolution to C constant in this transition.
    Besides, to avoid any collision shift by alien gas, we performed the absolute frequency measurement of 6S1/26D3/2 transition with a cesium cell whose vacuum was always kept at 10-10 by an ion pump. We obtained the value of 338 595 897 162 (51) kHz for 6S1/2 F=4 - 6D3/2 F=5 and 338 600 493 491 (15) kHz for 6S1/2 F=3 - 6D3/2 F=5 respectively.

    目錄 摘要.............................................Ⅰ 目錄............................................Ⅱ 圖目錄......................................... Ⅳ 表目錄..........................................Ⅵ 第一章 研究動機與歷史背景........................1 1.1 研究動機.................................1 1.2 銫原子6S-6D的相關實驗.....................2 第二章 基本理論.................................5 2.1 超精細結構...............................5 2.2 銫原子6S-6D雙光子躍遷.....................7 2.3 雙光子躍遷...............................8 2.4 Doppler-free 雙光子光譜..................9 2.5 Zeeman effect...........................12 第三章 實驗架設.................................15 3.1 穩頻雷射系統.............................16 3.2 掃頻雷射系統.............................20 3.3 偏頻鎖相.................................21 第四章 實驗結果.................................24 4.1 雷射穩頻與偏頻鎖相穩定度探討...............24 4.2 6S-6D超精細結構之量測及誤差討論...........30 4.3 銫原子6D3/2超精細耦合常數.................40 4.4 絕對頻率量測之量測........................41 4.5 結論.....................................44 參考文獻.........................................45 附錄.............................................46 附錄一 免除螢光干擾後的頻率偏移測量...............................................46 附錄二 頻率偏移的測量.............................48

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