English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 80990/80990 (100%)
造訪人次 : 41633847      線上人數 : 3938
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋


    請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/83550


    題名: 無頻率調制銣原子光鐘之研究;The study of rubidium optical clock without frequency modulation
    作者: 石宇哲;SHIH, YU-JHE
    貢獻者: 物理學系
    關鍵詞: 銣原子;二級光鐘;Rubidium;secondary optical clock
    日期: 2020-08-20
    上傳時間: 2020-09-02 15:48:38 (UTC+8)
    出版者: 國立中央大學
    摘要: 本論文為了發展銣原子二級光鐘以建立時間頻率標準。實驗上,我們利用電光調制器將778 nm光纖雷射鎖在銣原子雙光子躍遷的交叉譜線。藉由改變電光調制器的調制頻率,進而改變雷射的頻率,以精密地量測銣原子5S-5D雙光子躍遷譜線。778 nm穩頻雷射的穩定度,在1秒的積分時間,Allan deviation已達到5×10^(-12),因為量測受限於銫原子鐘的穩定度,所以我們認為778 nm穩頻雷射的穩定度會更好。
    我們修正光強度偏移造成原子躍遷頻率偏移的影響,藉由超精細結構的能階間隔,推算A及B超精細結構常數為:
    A(85Rb,5D5/2):-2.2122(24) MHz,B(85Rb,5D5/2):2.6881(38) MHz,A(87Rb,5D5/2):-7.4595(29) MHz,B(87Rb,5D5/2):1.2748(23) MHz。同位素偏移(Isotope shift):160.630(7) MHz。
    ;The aim of this thesis is to develop a rubidium secondary optical clock to establish a time and frequency standard. In this experiment, the 778 nm fiber laser is locked to crossover lines of rubidium two-photon transition via electro-optical modulator. When changing the modulation frequency of the electro-optic modulator, the laser frequency is correspondingly changed. So we can precisely measure the 5S-5D two-photon transition spectrum in rubidium.
    For the stability of the 778 nm frequency-stabilized laser, the Allan deviation can reach 5×10^(-12) within 1 second of integration time. We believe that the stability of the 778 nm frequency-stabilized laser is better, because the measurement is limited by the stability of cesium atomic clock.
    We correct the influence of the shift of atomic transition frequency caused by light intensity. In addition, we calculate the A and B hyperfine structure constants by using the energy level interval of hyperfine structure.
    A(85Rb,5D5/2):-2.2122(24) MHz, B(85Rb,5D5/2):2.6881(38) MHz, A(87Rb,5D5/2):-7.4595(29) MHz, B(87Rb,5D5/2):1.2748(23) MHz. Isotope shift:160.630(7) MHz.
    顯示於類別:[物理研究所] 博碩士論文

    文件中的檔案:

    檔案 描述 大小格式瀏覽次數
    index.html0KbHTML198檢視/開啟


    在NCUIR中所有的資料項目都受到原著作權保護.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 隱私權政策聲明