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    請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/74298

    題名: Laser cooling and optical trapping of potassium with tunable interaction toward quantum gas production
    作者: 廖冠博;Liao, Guan-Bo
    貢獻者: 物理學系
    關鍵詞: 鉀-39 原子;雷射冷卻;光學陷阱;磁費許巴赫共振
    日期: 2017-09-25
    上傳時間: 2017-10-27 13:42:43 (UTC+8)
    出版者: 國立中央大學
    摘要: 本實驗的目標是要實現鉀-39 原子的全光學式量子氣體,
    我們透過小角度交叉重疊兩道光學陷阱(optical dipole
    動。使用這個長寬比小於 20 的複合式光學陷阱,可以穩定
    補捉 1 ~ 2*106個鉀原子。然後我們使用磁費許巴赫共振技
    術去控制原子間的交互作用,並測量了從 20 G 至 560 G 之
    振技術的幫助將鉀原子團的溫度降至 10 μk 以下時發現,S
    7 *10-3。
    ;The goal of this experiment is to realize all-optical 39K Bose-Einstein Condensates (BEC). We improved the trap loading of a near-IR laser by crossing two beams at a small angle for good loading and tighter axial confinement. With this composite trap, we can routinely trap 1 ∼ 2×106 cold 39K atoms and confine them in a potential well with a trap aspect ratio of less than 20. We then used magnetic Feshbach resonance (FR) to control the atomic interaction in the optical trap. The S-wave scattering length is greatly tuned to improve the two-body elastic collision rate in the trap. We scanned the magnetic field from 20 ∼ 560 G and found intra-spin and inter-spin resonances. Several peaks we found were predicted by literature but not experimental reported to our knowledge. With the help of FR, the best phase space density was increased to 7×10−3 by force evaporative cooling.
    顯示於類別:[物理研究所] 博碩士論文


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