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系統識別號 U0026-2607201415323501
論文名稱(中文) 光泵浦效應對銫原子階梯式電磁誘發透明的影響
論文名稱(英文) Optical Pumping Effects on Electromagnetically Induced Transparency in a Three-level Cascade-type System of Cesium Atom
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 102
學期 2
出版年 103
研究生(中文) 蘇靖淵
研究生(英文) Ching-Yuan Su
學號 L26011126
學位類別 碩士
語文別 中文
論文頁數 85頁
口試委員 口試委員-韓殿君
指導教授-蔡錦俊
口試委員-陳泳帆
中文關鍵字 銫原子  電磁誘發透明 
英文關鍵字 Cesium  electromagnetically induced transparency 
學科別分類
中文摘要 本論文鎖定探測光在銫原子D2 line的超精細結構,並掃描耦合光到8s的超精細結構,觀測銫原子階梯式電磁誘發透明現象。
實驗訊號要考慮速度群、綴飾態、多重中間態等因素的影響,我們考慮這些因素,並進行理論模擬,在訊號的相對位置上,我們以綴飾態模型去分析,並得到相當不錯的擬合結果,在訊號的強度上我們加入雙光子躍遷機率與光泵浦效應進行模擬,但無法擬合得很好,最後我們發現當基態一樣時,即使探測光鎖定在不同能階亦可以用一組參數去擬合訊號強度。
接著我們觀測探測光強度對電磁誘發透明的影響,我們也做加入光泵浦效應與否之模擬的比較,當探測光強度增加時,對比模擬的訊號圖,我們可以發現其對訊號的影響並不是線性的,探測光強度增加時,增強吸收訊號亦會越來越強。並且我們利用較強的探測光,成功觀測綴飾態的存在,但在實驗的訊號位置上與理論模擬則有些許差距。
英文摘要 This thesis analyzed the line intensities of the electromagnetically induced transparency in a three-level cascade-type system of cesium. The probe beam lock on different Cs D2 line hyperfine transitions and the coupling laser scanned over the 8s states to record the EIT spectra.

Due to the effects of the atoms with different velocity, the dressed states, multi-level intermediate states, wavelength miss matching, have to take into account for construction the simulation. The position of the EIT signals could fit well with the dressed state theory. But the amplitudes of the EIT signals cannot be well fitted, even we took the two photon transition probability and the optical pumping effect into account. Finally, we found that if the ground state was the same, we could use a set of parameters to fit the amplitudes even the probe beam locked in different transitions.

The signal of electromagnetically induced transparency affected by the power of probe beam was observed. The simulation with optical pumping effect is considered. Comparing the simulation results, we found that the effect on the signal was not linear as the power of probe beam increasing so does the enhanced absorption increasing too. And the dressed states can be observed with high power probe beam. However, the position of the experimental signals was a little different from the theory simulations.
論文目次 摘要 I
Extended Abstract II
致謝 VI
目錄 VII
表目錄 IX
圖目錄 X
第一章 緒論 1
1.1 研究目的 1
1.2 電磁誘發透明簡介 1
1.3 銫原子簡介 2
第二章 基本理論 4
2.1 密度矩陣 4
2.2 光與原子交互作用 6
2.2.1 二能階系統 6
2.2.2 三能階系統與電磁誘發透明 12
2.2.3 電磁誘發透明與都卜勒效應 15
2.2.4 綴飾態 18
2.3 光泵浦效應(Optical Pumping) 25
第三章 實驗儀器及架設 30
3.1 實驗架設與步驟 30
3.2 實驗儀器 32
3.2.1 探測雷射 32
3.2.2 耦合雷射 32
3.2.3 光電倍增管(PMT) 33
3.3 雷射穩頻 35
3.4 雷射掃頻與資料擷取 40
第四章 實驗結果與分析 41
4.1 光譜頻率軸尺度校正 41
4.2 電磁誘發透明訊號模擬分析 43
4.2.1 訊號相對位置 43
4.2.2 模擬 47
4.3 探測光強度對電磁誘發透明的影響 59
4.4 利用電磁誘發透明觀察綴飾態 64
第五章 結論 71
參考文獻 72
附錄A 75
附錄B 81
附錄C 84
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[24]何宗勳, 銫原子中階梯式電磁誘發透明的躍遷特性 (成功大學博士論文, 2013).
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