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系統識別號 U0026-2808201823333700
論文名稱(中文) 利用電磁誘發透明法研究室溫下Cs 11S超精細結構的偏振相依性
論文名稱(英文) Study the Polarization Dependence of Cs 11S Hyperfine Structure at Room Temperature Using Ladder-Type Electromagnetically Induced Transparency
校院名稱 成功大學
系所名稱(中) 物理學系
系所名稱(英) Department of Physics
學年度 106
學期 2
出版年 107
研究生(中文) 阮氏垂
研究生(英文) Thuy Nguyen-Thi
學號 L26057033
學位類別 碩士
語文別 英文
論文頁數 44頁
口試委員 指導教授-蔡錦俊
口試委員-黃守仁
口試委員-崔祥辰
中文關鍵字 電磁誘發透明 (EIT)  銫11S1/2超精細結構  偏振相依性 
英文關鍵字 Electromagnetically induced transparency (EIT)  cesium 11 S1/2 hyperfine structure  polarization dependence. 
學科別分類
中文摘要 在原子光譜學中稱為電磁誘發透明 (electromagnetically induced transparency EIT)的幫助下,本論文研究了在銫原子尺度中的量子干涉現象。EIT 是通過引入另一個電磁場消除了共振吸收,從而在不透明材料中產生具有小於自然線寬的窄透明窗口。以一種可以想像的方式來解釋 EIT 的初步想法是,當另一個光源參與作用時,光束穿過介質後變得更亮。EIT 發生的條件將在理論上得出,並在本論文中透過實驗觀察。梯形的EIT架構是用來研究含超精細結構的銫原子從6S-6P-11S在室溫下的三能階系統並且探討在光場具有偏振下的相依性。兩道重疊線偏振光的相對偏振角度會對於觀察到的峰值訊號會有顯著的影響。在此篇論文中我們把相對角度訂為0,45與90度。當角度為90度時,44’3’’ 的峰值比0度高出約6.5倍。同時,44’4’’ 的高度會隨著兩道線偏振光的相對偏振角度增加而稍微的下降。
英文摘要 The quantum interference phenomenon in the cesium atomic scale is considered here with the help of a powerful technique in atomic spectroscopy termed as electromagnetically induced transparency (EIT). EIT eliminates a resonant absorption by introducing another electromagnetic field, resulting in a narrow transparency window with sub-natural linewidth in an opaque material. An imaginable way to pick up some first ideas about EIT is by imaging that a light beam passes through a medium getting brighter when another overlapping light source is introduced. The conditions for EIT to happen will be derived theoretically and observed experimentally in this thesis.
An experimental setup for the ladder-type EIT is exploited to study the hyperfine levels of 133Cs 11S1/2 state, which involves the 6S1/2-6P3/2-11S1/2 transition under room temperature, with polarization dependence. The change of the relative angle between two polarization planes of the two linearly polarized fields results in a significant change in the peak height of the observed EIT spectra. That relative angle is set at 0o, 45o, and 90o in this experiment. As the relative angle at 90o the intensity of peak 44′3′′ is 6.5 times higher than that of the relative angle at 0o. Meanwhile, the intensity of peak 44′4′′ slightly decreases as increasing the relative angle between the two polarizations of the probe and coupling fields.
論文目次 ABSTRACT I
摘要 II
Acknowledgments III
LIST OF TABLES VI
LIST OF FIGURES VII
CHAPTER 1 INTRODUCTION 9
CHAPTER 2 THEORETICAL DESCRIPTION 13
2.1 THE DENSITY MATRIX 13
2.1.1 Nomenclature and Properties 13
2.1.2 Time dependence of the density operator 14
2.2 LIGHT – ATOM INTERACTION 16
2.3 THE OPTICAL BLOCH EQUATIONS 19
2.4 FROM DENSITY TO SUSCEPTIBILITY 20
2.5 OPTICAL ABSORPTION OF A MEDIUM 22
2.6 EIT IN THREE–LEVEL ATOM 23
CHAPTER 3 ROOM TEMPERATURE ELECTROMAGNETICALLY INDUCED TRANSPARENCY 26
3.1 ATOMIC STRUCTURE OF CESIUM 26
3.2 OPTICAL SETUP FOR EIT 29
3.2.1 External Cavity Diode Laser – Probe Laser 29
3.2.2 Saturated Absorption Spectroscopy 29
3.2.3 Dye Ring Laser – Coupling Laser 32
3.2.4 Primary experiment Setup 32
3.3 EXPERIMENTAL RESULTS 34
3.3.1 Observations of EIT in Cs 11 S1/2 hyperfine state under room temperature 34
3.3.2 Power dependence 35
3.3.3 Polarization dependence 37
CHAPTER 4 CONCLUSION AND SUGGESTIONS 42
REFERENCES 43

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