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研究生: 黃煒竣
Huang, Wei-Chun
論文名稱: 建立在電磁波誘發透明的光拖曳之實踐與可能增進方向之探討
Implementation and Improvable Orientation of Light-Dragging Effect in Electromagnetically Induced Transparency Medium
指導教授: 管培辰
Kuan, Pei-Chen
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: 2024
畢業學年度: 112
語文別: 中文
論文頁數: 55
中文關鍵詞: 電磁波誘發透明光拖曳
外文關鍵詞: Electromagnetically Induced Transparency, Light-dragging effect
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  • 光拖曳現象是指一種相對於靜止觀察者,介質中光速會受介質移動速度影響的現象;而電磁波誘發透明(EIT, Electromagnetically Induced Transparency)是一種量子光學現象,同時此現象也會造成介質中光於 EIT 共振頻率附近的群速度下降,又稱慢光,而本文主要研究了發生於室溫電磁波誘發透明介質中的光拖曳現象。本實驗中使用了常溫銣85原子中的 D1-Line EIT 系統作為光拖曳的介質,並使用了移動平台進行光拖曳的實踐。
    實驗中使用了三方向的亥姆霍茲線圈以及$mu $-metal進行磁場的補償及屏蔽,另外也使用了 3D 列印技術客製化零件進行系統的最小化,並在接近零磁場及加熱並加入幫浦光的條件下,進行了 EIT 慢光延遲時間及光拖曳造成的相位偏移量測,其中光拖曳相位偏移部分採用了外差檢測的方式進行量測。
    實驗中測得了最大延遲時間 0.805 µs 以及相位偏移靈敏度 4.81 mrad/(mm/s),其中相位偏移靈敏度換算為光拖曳係數約為 2608.28,並以此結果與以其他 EIT 系統作為介質的研究進行比較,最後對於系統量測方式中可能的增進方向以及進一步作為陀螺儀應用的可能性進行討論。

    The phenomenon of light-dragging refers to the effect where the speed of light within a moving medium is influenced by the moving velocity of the medium, relative to a stationary observer. Electromagnetically Induced Transparency (EIT) is a quantum optical phenomenon that also causes the group velocity of light within a medium to decrease near the EIT resonance frequency, a phenomenon often referred to as "slow light". This thesis primarily investigates the light-dragging effect occurring in a room-temperature medium under EIT conditions. In the experiment, the D1-Line EIT system in rubidium-85 atoms at room temperature was used as the medium for light-dragging, with a linear moving platform to achieve the light-dragging effect. Magnetic field compensation and shielding were achieved using three-axis Helmholtz coils and µ-metal. Additionally, custom parts were minimized through 3D printing technology. Under conditions of near-zero magnetic fields, heating, and the introduction of pumping light, measurements were taken for the delay time which is caused by EIT-induced slow light, and the phase shift caused by the light-dragging effect. The phase shift due to light-dragging was measured using a heterodyne detection method. The experiment recorded a maximum delay time of 0.805 µs and a phase shift sensitivity of 4.81 mrad/(mm/s), corresponding to a light-dragging coefficient of approximately 2608.28. These results were compared with studies using other EIT systems as the medium. The end of this thesis also concludes with a discussion of potential improvements in the measurement methods and the further applicability of this system as a gyroscope.

    1 緒論 1 1.1 引言 1 1.2 電磁波誘發透明 3 1.3 光拖曳 6 2 實驗架設 7 2.1 銣原子能階 7 2.2 雷射鎖頻與頻率調變 9 2.3 外差檢測設置 11 2.4 光路架設 12 2.5 移動平台 14 2.6 3D 列印與零件設計 16 2.7 地磁屏蔽與補償 18 2.8 原子腔體加熱 23 2.9 去除凝結於管壁之銣原子 25 2.10 EIT 訊號量測 27 2.11 延遲時間量測 28 2.12 光拖曳量測 30 3 實驗結果與討論 31 3.1 地磁補償與屏蔽 31 3.2 幫浦光強度 33 3.3 加熱與延遲時間 35 3.4 光拖曳量測 37 4 結論與未來展望 38 4.1 結論 38 4.2 未來展望 39 參考文獻 41

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