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研究生： 丁羿丰
Ding, Yi-Feng
論文名稱： 超冷原子中光學前驅之操控
Manipulation of optical precursor in ultracold atoms
指導教授： 褚志崧
Chuu, Chih-Sung
口試委員: 余怡德
Yu, Ite-Albert
劉怡維
Liu, Yi- Wei
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： 2019
畢業學年度： 107
語文別： 中文
論文頁數： 53
中文關鍵詞： 光學前驅 、冷原子 、雙光子
外文關鍵詞： precursor, cold atoms, biphoton
相關次數： 點閱：3  下載：0 
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    • 我們研究在四波混頻(spontaneous Four-Wave-Mixing ,sFWM)的機制下，借由控制Coupling detuning來改變我們的雙光子波包，同時藉此來控制我們的光學前驅(optical precursor)。因為光學前驅相比於主要波包(main signal)來說具有不易被介質所吸收的特性，因此有利於通訊傳輸，例如水下通訊。

    We exploit the spontaneous four-wave-mixing (sFWM) to generate time-energy entangled photon pairs using cold atoms. By controlling the coupling detuning, we demonstrate controlled optical precursors and modulated biphoton wavepacket. Because the optical precursor can propagate in the resonant medium with much lower loss than the main signal, it has the potential application in communication in dense material like under-water communication.

    摘要 i 目錄 iii 第一章 緒論 1 第二章 理論計算 3 2.1 自發四波混頻(Spontaneous four wave mixing) 3 2.2 在交互作用觀(interaction picture)下的Hamiltonian 7 2.3 線性與非線性電極化率 8 2.3.1 重寫anti-Stokes的 x^((3)) 10 2.4 Group Delay 區間 13 2.5 主要波包(Main signal) 15 2.6 光學前驅的理論 20 2.7 雙光子波形通過介質的吸收所造成的變化 23 2.7.1 OD對系統的影響 25 2.8 phase-matching的入射光角度對系統的影響 26 2.9 Ωc的強度對光學前驅的影響 28 第三章 實驗架設 33 3.1 sFWM的實驗架設 33 3.2 MOT 33 3.3 超精細結構 36 3.3.1 780nm和795nm雷射 36 3.3.2 能階 38 3.4 時序 39 第四章 實驗結果 40 4.1 EIT的測量 40 4.2 驗證Cauchy-Schwartz不等式 41 4.3 雙光子的光學前驅 43 4.4 主要波包 46 第五章 結論 50 附錄 51 參考資料 52

    [1] Shanchao Zhang, Ph.D. thesis, Coherent Quantum Interaction between Photons and Atoms, Department of Physics,The Hong Kong University of Science and Technology(2013).
    [2] Daniel Adam Steck, Rubidium 87 D Line Data, Oregon Center for Optics and Department of Physics, University of Oregon (13 January 2015).
    [3] Daniel J. Gauthier, Duke University, and Robert W. Boyd, University of Rochester, Fast Light, Slow Light and Optical Precursors: What Does It All Mean? , Photonics spectra (January 2007).
    [4] Chun-Wei Yang, master thesis, Theory and experimental preparation of biphoton generation with atomic ensemble ,National Tsing-Hua University(2017)
    [5] Chuan-Yi Li, master thesis, Quantum light generation and storage using cold atomic ensemble ,National Tsing-Hua University(2018)
    [6] Shengwang Du, Chinmay Belthangady, Pavel Kolchin, G. Y. Yin, and S. E. Harris, Observation of optical precursors at the biphoton level, OPTICS LETTERS, Vol. 33, No. 18, September 15, 2008.
    [7] Shengwang Du, Jianming Wen, and Morton H. Rubin, Narrowband biphoton generation near atomic resonance, Journal of the Optical Society of America B Vol. 25, No. 12 ,December 2008.
    [8] Shengwang Du, Jianming Wen, and Chinmay Belthangady, Temporally shaping biphoton wave packets with periodically modulated driving fields, PHYSICAL REVIEW A 79, 043811 2009.
    [9] J. F. Chen, S. Zhang, H. Yan, M. M. Loy, G. K. Wong, and S. Du, "Shaping biphoton temporal waveforms with modulated classical fields," Phys Rev Lett 104 (18), 183604 (2010).
    [10] S. H. Choi and U. Osterberg, "Observation of optical precursors in water," Phys Rev Lett 92 (19), 193903 (2004).
    [11] Jianming Wen, Shengwang Du, and Morton H. Rubin, "Spontaneous parametric down-conversion in a three-level system," Physical Review A 76 (1) (2007).
    [12] J. F. Chen, Shuyuan Wang, Dong Wei, M. M. T. Loy, G. K. L. Wong, and Shengwang Du, "Optical coherent transients in cold atoms: From free-induction decay to optical precursors," Physical Review A 81 (3) (2010).
    [13] S. Zhang, J. F. Chen, C. Liu, M. M. Loy, G. K. Wong, and S. Du, "Optical precursor of a single photon," Phys Rev Lett 106 (24), 243602 (2011).

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