同調性毫赫茲以下的光學偏頻鎖相系統測 量高分辨率的銫原子 6S-6D 超精細躍遷

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姓名

林佳緯(Chia-wei Lin) 查詢紙本館藏

畢業系所

物理學系

論文名稱

同調性毫赫茲以下的光學偏頻鎖相系統測量高分辨率的銫原子 6S-6D 超精細躍遷
(Sub-mHz-coherence optical offset locking for high-resolution cesium 6S-6D hyperfine transitions)

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★ Direct comb laser spectroscopy of Cs 6S-8S, Rb 5S-5D hyperfine transitions—toward building up a novel Ti:sapphire comb laser with merely 6cm Cs-Rb mixed cell

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摘要(中)

藉著不同偏頻鎖相系統的方法，試著將兩台雷射的頻率差固定。成功將一台半導體雷射(僕雷射)與另一台頻率穩定的雷射(主雷射)做偏頻鎖相，產生高穩定的頻率差。本論文將介紹一個創新且簡單的偏頻鎖相系統，包括自製的相位偵測器與使用的 PI迴路。為了增加拍頻的功率，我們做出一台 tracking Oscillator，且為了增加 capture range ，以數位計數器維基礎做出修改版本。使用數位式與類比式相位偵測器的光學偏頻鎖頻系統，並且測量雷射拍頻的 3-dB 線寬。本論文中最好設計的拍頻的3-dB 線寬小於 1 mHz。
主雷射也是半導體雷射且擁有獨立的鎖頻系統，所以主雷射能提供穩定的參考頻率給僕雷射使用。最後，使用兩種不同的方法操作光學偏頻鎖相系統，測量銫原子的6S-6D的超精細躍遷譜線。藉由本論文中偏頻鎖相的技術，改變僕雷射頻率達到掃描銫原子譜線的目的。

摘要(英)

We tried to make frequency difference of two lasers be stable by some offset locking. Using different approaches, we successfully offset locked the frequency of one diode laser (slave laser) against the other frequency-stabilized laser (master laser), resulting in a highly stable frequency difference. A novel and simple scheme of electronic offset locking includes phase detector, PI loop filter is reported. For boosting up the beat-note power, we also built up a tracing oscillator with which a freency counter-based device was installed for extending the capture range. We use both digital and analogic phase detector to demonstrate the optical offset locking. We used different approaches to measure 3-dB linewidth of beat-note. The best design can make the 3-dB linewidth of beat-note be smaller than 1 mHz.
The master laser was a diode laser having an independent frequency locking system that could serve as a stable reference frequency of slave laser. To sum up, we can control optical offset locking to monitor cesium 6S1/2-6D2/3 hyperfine transitions by two approaches. The purpose is to scan cesium hyperfine transitions by changing the frequency of slave laser, using the developed offset locking technique in this thesis.

關鍵字(中)

★ 偏頻鎖相
★ 鎖相迴路
★ 銫原子超精細結構躍遷

關鍵字(英)

★ offset locking
★ phase locked loop
★ cesium hyperfine transitions

論文目次

致謝 I
摘要 II
Abstract III
圖表目錄 VI
第一章歷史背景與動機 1
第二章原理 6
一、鎖相迴路 6
二、數位相位偵測器 12
三、帶通濾波器鎖頻線路 27
四、相位雜訊與頻譜密度 36
第三章實驗裝置 41
一、光鎖相迴路與雷射腔內式光譜(intra-cavity spectroscopy) 41
二、雷射特性與光路零件 52
三、帶通濾波鎖頻迴路 53
四、使用儀器 55
五、 CPLD與數位+類比相位頻率偵測電路設計 56
六、 Tracking Oscillator 62
第四章實驗成果 66
一、線寬的量測 66
二、相位雜訊 73
三、其他實驗設置的測量 75
四、 Tracking Oscillator測量 84
五、銫原子6S1/2到6D3/2的譜線掃描 86
第五章未來展望 98
附錄 99
使用電阻型電感製做帶通濾波鎖相迴路 99
雷射偏頻鎖頻使用除頻器的結果 100
電子電路零件 102
儀器列表 103
計算內心 103
參照 108

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指導教授

鄭王曜(Wang-yau Cheng)

審核日期

2016-1-28

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