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研究生:廖期川
研究生(外文):Chi-ChuanLiao
論文名稱:銣原子的階梯式電磁誘發透明
論文名稱(外文):Cascade-Type Electromagnetically Induced Transparency of Rubidium atom
指導教授:蔡錦俊
指導教授(外文):Chin-Chun Tsai
學位類別:碩士
校院名稱:國立成功大學
系所名稱:物理學系碩博士班
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:48
中文關鍵詞:電磁誘發透明銣原子超精細結構
外文關鍵詞:electromagnetically induced transparencyrubidiumhyperfine structure
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本論文以銣原子氣體進行階梯式電磁誘發透明實驗,並觀測銣原子同位素87Rb,在激發態5D5/2、9S1/2的超精細結構。當弱光的探測雷射波長為780.2 nm (5S1/2→5P3/2的共振頻率)通過Rb蒸氣分子時會被吸收,但是如果同時有另一強光的耦合雷射波長為776 nm (5P3/2→5D5/2),或565 nm (5P3/2→9S1/2)的存在時,則會發生探測雷射的穿透現象。此為探測雷射及耦合雷射皆達到銣原子能階躍遷頻率,產生原子波函數的量子干涉的結果,稱之為電磁誘發透明。實驗使用探測雷射與耦合雷射反向對打,並且在銣原子蒸汽樣本中使之重合,銣原子同時受到兩種不同頻率的光場作用。其中,探測雷射的頻率鎖定在銣原子D2 躍遷的超精細結構譜線上,而耦合雷射則在銣原子高能態的躍遷頻率附近進行掃描,藉以研究其超精細結構。藉由觀察探測雷射的穿透強度變化,以及受激發原子自發衰變的螢光訊號,可以量測銣原子的階梯式電磁誘發透明的能譜,並將實驗結果與模擬計算做比較,目前實驗結果的訊噪比還不足以有效分析87Rb (5D5/2、9S1/2)的超精細結構。
The hyperfine structure of 87Rb 9S1/2 and 5D5/2 states was investigated using cascade-type electromagnetically induced transparency (EIT) in this thesis. The theoretical modeling the transparency of a weak probe laser beam at 780.2 nm (5S1/2→5P3/2) under the interaction with a strong coupling laser beams at 565 nm or 776 nm (5P3/2→9S1/2 or 5P3/2→5D5/2) was obtained by solving the steady state solutions of optical-Bloch equations. This transparency is due to the quantum interference of the atomic wavefunctions under the photon-atom interactions. To carry out the experiment, a probe laser and a coupling laser are counter-propagated, overlapped inside the rubidium vapor cell. The frequency of probe laser was stabilized at D2 line hyperfine transitions of 87Rb and the coupling laser scanned across the transitions of excited states to investigate their hyperfine structure. The EIT and laser induced fluorescence spectrum of rubidium atom were detected by measuring the transmission of the probe laser or fluorescence from the excited atoms. The simulation result agrees well with the experimental spectra. However, there is no further hyperfine results can be made due to bad signal to noise ratio.
摘 要................ I
Abstract................II
致 謝 ................III
目 錄 ................IV
圖表目錄 ................VI
第一章 緒論................1
1-1 研究目的................1
1-2 銣原子特性................1
1-3 電磁誘發透明簡介................2
第二章 實驗原理................4
2-1 原子超精細結構................4
2-2 階梯式電磁誘發透明................7
2-2-1 密度矩陣的運動方程式 ................7
2-2-2 三能階系統................9
第三章 實驗系統架設................15
3-1 探測雷射................15
3-1-1 外腔二極體雷射................15
3-1-2 無都卜勒效應飽和吸收光譜................16
3-1-3 聲光調變器................20
3-2 耦合雷射................21
3-2-1 滲鈦藍寶石環狀雷射................21
3-2-2 染料環狀雷射................22
3-2-3 雷射頻率掃動................22
3-3 電磁誘發透明系統架設................22
第四章 實驗結果與分析................25
4-1 階梯式電磁誘發透明實驗結果................25
4-2 階梯式電磁誘發透明實驗結果................32
第五章 結論................41
參考文獻................42
附錄................44
附錄一、 超精細結構常數................44
附錄二、雷射鎖頻裝置電路圖Lock-in & PID................45
附錄三、速度原子高斯分佈................47
附錄四、EIT模擬程式................48
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