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系統識別號 U0026-0509201300460900
論文名稱(中文) 利用電磁誘發透明測量銫原子雷德堡態的精確頻率
論文名稱(英文) High precision frequency measurement of the Cs Rydberg state by electromagnetically induced transparency
校院名稱 成功大學
系所名稱(中) 光電科學與工程學系
系所名稱(英) Department of Photonics
學年度 101
學期 2
出版年 102
研究生(中文) 陳維甫
研究生(英文) Wei-Fu Chen
學號 L76001074
學位類別 碩士
語文別 中文
論文頁數 63頁
口試委員 指導教授-蔡錦俊
口試委員-陳泳帆
口試委員-黃守仁
口試委員-韓殿君
中文關鍵字 銫原子  超精細結構  電磁誘發透明 
英文關鍵字 cesium  hyperfine structure  electromagnetically induced transparency(EIT) 
學科別分類
中文摘要 本論文利用電磁誘發透明的現象研究室溫銫原子62S1/2->62P3/2->82S1/2躍遷,並針對其譜線線形、譜線間距和譜線線寬做測量分析與討論。由於探測雷射與耦合雷射光源之間的波長不匹配因子κ(=852.3/794.6),解釋室溫電磁誘發透明光譜的訊號間的相對位置偏移,即ΔEhfs(1-κ);舉例來說:62P3/2超精細結構F’=4和5產生電磁誘發透明的頻率偏移為18.23 MHz。然後以耦合至82S1/2超精細結構F’’=3和4的電磁誘發透明頻率間距來推算出82S1/2超精細結構常數,其中七組數值為218.62±0.44 MHz。接下來透過積分原子速度群分布來解釋電磁誘發透明譜線增強吸收線形和其線寬變窄的現象。最後探討耦合雷射光強度對電磁誘發透明窗口寬窄的影響,其中可以於Ωc=10.57 MHz觀察到小於自然線寬(Γ2=5.22 MHz)的穿透窗口。我們實驗中發現,當調弱耦合雷射的拉比頻率時,可得到最小線寬為1.96(28) MHz。
英文摘要 This thesis studies the phenomena of ladder-type electromagnetically induced transparency (EIT), including line shape, frequency position and linewidth of the transmission signals, on 62S1/2->62P3/2->82S1/2 transition in room temperature cesium cell. The relative frequency of transmission signals are well explained by introducing the wavelength mismatch factor κ(=852.3/794.6) between the probe and coupling laser, i.e. ΔEhfs(1-κ). For example, the relative frequency of the transmission signal through the intermediate states │62P3/2, F’=3> and │62P3/2, F’=4> is about 18.23 MHz. The hyperfine constant of 82S1/2 is calculated by directly measured frequency difference between the transmission signals coupling to │82S1/2, F”=3> and │82S1/2, F”=4>, as following 218.62±0.44 MHz. Additionally, the enhanced absorption dips on both wings and narrowing effect on linewidth can be well explained while considering the integration of velocity groups. Finally, we investigate the linewidth of transmission signal by adjusting the coupling Rabi frequency. Subnatural linewidth below Γ2(=5.22 MHz) of EIT is obtained even though the coupling Rabi frequency is as large as 10.57 MHz. Furthermore, the narrowest EIT linewidth is 1.96(28) MHz by lowering the coupling Rabi frequency.
論文目次 摘要 I
ABSTRACT II
致謝 III
目錄 V
圖目錄 VI
表目錄 VIII
第一章 緒論 1
1.1 研究背景 1
1.2 研究目的 1
第二章 基本理論 4
2.1 密度矩陣表述 4
2.2 光與物質的交互作用 8
2.2.1 二能階系統 8
2.2.2 三能階系統與電磁誘發透明 11
第三章 實驗架構 17
3.1 實驗儀器 17
3.1.1 探測雷射 17
3.1.2 耦合雷射 18
3.2 實驗系統 19
3.2.1 雷射穩頻 19
3.2.2 雷射掃頻與探測 27
3.3 實驗架設 30
第四章 實驗結果與分析 32
4.1 耦合雷射頻率軸尺度校正 32
4.2 室溫原子對電磁誘發透明的影響 34
4.2.1 訊號線形 35
4.2.2 穿透訊號的相對位置 40
4.3 耦合雷射強度對電磁誘發透明的影響 57
第五章 結論 61
參考文獻 62
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