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系統識別號 U0026-0812200915060874
論文名稱(中文) 銫原子中多重態的電磁引發透明
論文名稱(英文) Electromagnetically induced transparencies in a multi-level system of Doppler-broadened Cesium atom
校院名稱 成功大學
系所名稱(中) 物理學系碩博士班
系所名稱(英) Department of Physics
學年度 97
學期 1
出版年 98
研究生(中文) 李明宗
研究生(英文) Ming-Tsung Lee
電子信箱 tzjduens@gmail.com
學號 L2696402
學位類別 碩士
語文別 英文
論文頁數 73頁
口試委員 口試委員-陳泳帆
口試委員-韓殿君
指導教授-蔡錦俊
中文關鍵字 電磁引發透明  綴飾態 
英文關鍵字 dressed state  electromagnetically induced transparency 
學科別分類
中文摘要 本論文主要是探討在多重能階下電磁引發透明現象的理論及實驗結
果。實驗主要分成兩個部份,第一部份是在室溫銫原子的三能階系統下
觀察雙重綴飾態的電磁引發透明現象;利用兩道強度及頻率不同的雷射
光在銫原子中產生階梯式的電磁引發透明的訊號,強度較小的雷射光稱
為探測雷射,反之則為耦合雷射;接著藉由聲光調制器來改變探測雷射
光頻率的調變,進而觀察到在不同頻率調變下電磁引發透明現象分裂的
情況,並在綴飾態的理論分析及密度矩陣的計算下得到不錯的擬合結
果。第二部份是考慮多重能階的電磁引發透明現象,此實驗為第一部份
的延伸,因此實驗參數也與第一部份大致相同,當探測雷射的頻率符合
銫原子的能階躍遷2 2
1/ 2 3/ 2 6 , 4 S F= →6P ,F=4且探測雷射強度增強時,我
們可以在探測雷射的吸收光譜上看到數個電磁引發透明的訊號,並記錄
不同雷射光強度下電磁引發透明現象的變化;利用綴飾態在多重能階系
統下來分析我們所觀察到的光譜,同時也用密度矩陣做理論計算及模
擬,並與實驗數據得到不錯的擬合結果。
英文摘要 In this thesis, we investigate the electromagnetically induced transparency (EIT) in a
multi-level system of cesium atom at room temperature for both experimental observations
and theoretical simulations. There are two parts of experimental configuration. The first
part is the observation of doubly dressed EIT by changing the detuning of probe laser,
which is corresponding to the hyperfine transition |62S1/2, F=4> → |62P3/2, F=5>. In a
ladder-type scheme, the double-peaked EITs were observed, produced by a strong coupling
laser and a moderate probe laser, at different detuning of probe laser. The coupling laser is
scanned across the hyperfine structure of |62P3/2> → |82S1/2> of Cs atom. The experimental
observations are in good agreement with the numerical simulations.
The second part is EITs in a multi-level system of Doppler-broadened cesium atom.
Most experimental conditions are similar with the first part, while the probe laser was
frequency-locked at the hyperfine transition |62S1/2, F=4> → |62P3/2, F=4> of Cs atom and
the coupling laser was scanned across the |82S1/2, F=3> and |82S1/2, F=4> levels. The
absorption spectra of the probe laser and their dependence on the intensity of the coupling
laser were investigated. The experimental measurements are also in good agreement with
the numerical simulations.
論文目次 摘要............... I
Abstract ........II
Acknowledgement......III
Contents........IV
List of Tables ..... VI
List of Figures .......VII
Chapter 1 ................... 1
1.1 Electromagnetically induced transparency...1
1.2 Overview ... 3
Chapter 2 ............ 4
2.1 Cesium atom... 4
2.2 The dressed-atom approach......... 6
2.3 Electromagnetically induced transparency...11
2.4 Density matrix approach ...... 13
2.4.1 Interaction picture ...... 13
2.4.2 Two-level system........... 14
2.4.3 Three-level system ..... 15
2.5 Simulation .. 18
Chapter 3 ....... 21
3.1 Laser systems ... 21
3.1.1 External cavity diode laser ...... 21
3.1.2 Injection-locked laser .... 23
3.1.3 Ti:sapphire ring-cavity laser........ 25
3.2 Frequency Control...... 27
3.2.1 Electronic feedback ...... 27
3.2.2 Doppler-free saturation absorption spectrum (DFSAS)............................. 28
3.2.3 Electromagnetically induced transparency (EIT).....32
3.2.4 Acousto-optical modulator (AOM) .. 33
3.3 Experimental Setup ...... 35
3.3.1 Doubly Dressed-State........ 35
3.3.2 Multi-Level System.... 37
Chapter 4 ........ 40
4.1 Splitting of double-peaked EIT ...... 40
4.2 The simulation with data .......... 44
4.3 Multi-level system................... 48
Chapter 5 ...... 57
Appendix A ..... 58
A.1 The quantization of a single-mode field... 58
A.2 The relative variation of the coupling υN. 61
A.3 Introduction of the Rabi frequency ...... 62
A.4 The anticrossing energy diagram (Fig. 2.4)... 63
A.5 dl and du calculations from -90~+90MHz ... 65
Appendix B ...... 66
Reference 69
Autobiography....... 73
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