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研究生：	阮氏妙賢 Hien, Nguyen Thi Dieu
論文名稱：	利用電磁誘發透明探討銣原子的超精細結構 The Hyperfine Structures of Rubidium Atom Using Electromagnetically Induced Transparency
指導教授：	蔡錦俊 Tsai, Chin-Chun
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：	2014
畢業學年度：	102
語文別：	英文
論文頁數：	62
外文關鍵詞：	Rubidium, Hyperne Structures, Electromagnetically Induced Transparency
相關次數：	點閱：59 下載：2
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In this work, we study the hyperfine structure of 87Rb in D-states by using Electromagnetically Induced Transparency (EIT). EIT is an atomic destructive phenomenon which is given by the interaction between a laser and an atom. In EIT, a weak probe light field, in resonance with an atomic transition, propagates through a medium with reduced absorption due to interaction with a strong coupling light field. EIT has studied in three energy levels included: ladder, Λ, V configurations.
In our experiment, we study the ladder type EIT of Rubidium atoms. The probe beam is strongly absorption with the |1> → |2> transition with the Rabi frequency Ωp. The coupling beam with the Rabi frequency Ωc is in the |2> → |3> transition. The decay rate of state |2> and |3> are given by Γ2 and Γ3, respectively. The EIT appears when the weak probe laser beam at 780.2 nm (5S1/2 → 5P3/2) and the strong coupling laser beam at 572.62 nm, 572.57 nm or 776 nm (5P3/2 → 7D3/2, 7D5/2 or 5P3/2 → 5D5/2). To improve the EIT to noise ratio, the laser frequency will be stabilized to a rubidium hyperfine transition to narrow the laser line-width while the coupling laser scanned cross over the transition of excited states.

Acknowledgments . . . . .  . . . . . . . I
Abstract . . . . . . . . . . . . . . . . . . . . V
List of Figures . . . . . .. . . . . . . . . . . . VI
Chapter 1: Introduction . .  . . . . . . . . . . . . 1
1.1 Rubidium Atoms . . . . . . . . . . . . . . . . 2
1.1.1 Properties of Rubidium Atoms .  . . . . . . . 2
1.1.2 Fine Structure and hyperne structure of Rubidium Atoms . 3
1.2 Electromagnetically Induced Transparency . . . . 7
Chapter 2: Theoretical Concepts . . . . . .. . . . . . . . . . 8
2.1 Density matrix equation of motion . . .  . . . . . . . . . 8
2.1.1 Interaction picture and Density matrix . . . . . . . . 8
2.1.2 Two level system . . . . . . . . . . . . . . . . . 10
2.1.3 Three level system . . . . . . .  . . . . . . . . 13
2.2 The Dressed state atom approaches . . . . . . . . . . 18
2.3 Intensity . . . . . . . . . . . . .. . . . . . . . . . 21
Chapter 3: Experiment Equipment and Setup . .. . . . . . 24
3.1 Experiment Setup . . . . . . . . . . . . . . . . . . 24
3.2 Laser systems . . . . . . . . . .. . . . . . . 25
3.2.1 External diode cavity laser . . . . . . . . . . . 25
3.2.2 Ti: Sapphire laser . . . . . . . . . . . . . . . . . . 28
3.2.3 Dye Ring laser . . . . . . . . .  . . . . . . . . . 29
3.3 Doppler saturation absorption spectroscopy . . . . . . . 30
3.3.1 Experiment setup . . . . . . . . . . . . . . 30
3.3.2 Rubidium DFSAS . . . . . . . . . . . . . . . . . 31
3.4 Laser stabilization . . . . . .  . . . . . . . . . . . . 33
Chapter 4: Result and Analysis . . .  . . . . . . . . . . 35
4.1 The spectrum for 5S1/2 → 5P3/2 → 5D5/2 .  . . . . . . 35
4.2 The spectrum for 5S1/2 → 5P3/2 → 7D3/2 . . . . . . 46
4.3 The spectrum for 5S1/2 → 5P3/2 → 7D5/2 . . . . . 49
Chapter 5: Conclusion . . . . . . . . . . . . .. . . . . 55
References . . . . . . . . . . . . . . . . . .. . . . . . 56
Appendix . . . . . . . . . . . . . . . . . .. . . . . . . 58
                                    

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