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研究生:趙偉智
研究生(外文):Chao, Weichih
論文名稱:探討在被動同步雙色鎖模光纖雷射中之脈衝走離效應
論文名稱(外文):Investigation of Pulse Walk-Off Effect in Passively Synchronized Two-Color Mode-Locked Fiber Lasers
指導教授:項維巍
指導教授(外文):Hsiang, Weiwei
口試委員:李澄鈴彭錦龍
口試委員(外文):Lee, ChenglingPeng, Jinlong
口試日期:2011-07-26
學位類別:碩士
校院名稱:輔仁大學
系所名稱:物理學系
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:2011
畢業學年度:99
語文別:中文
論文頁數:76
中文關鍵詞:交互相位調變脈衝走離效應束縛光固子對
外文關鍵詞:cross-phase modulation (XPM)pulse walk-off effectbound soliton pairs
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本論文探討在被動同步雙色鎖模光纖雷射中脈衝走離效應對交互相位調變效應的影響。實驗中的雙色鎖模光纖雷射為共振腔結合的摻鉺光纖雷射與摻鐿光纖雷射,1.56 μm脈衝與1.03 μm脈衝可在共同傳播段中藉由交互相位調變效應達成脈衝重複率同步。我們以交互相關儀測量雙色脈衝在共同傳播段中相對位置及其變化,以此估計脈衝走離效應及其對交互相位調變效應的影響。我們並在實驗中量得了雙色脈衝間相對位置與共振腔長變化的關係,發現因相對位置改變經由交互相位調變所估計得到的頻率位移與光譜上量到的中心波長變化趨勢一致,所以解釋了如何在具有脈衝走離效應的雙色光纖雷射中達成被動同步。除此之外,我們觀察到在被動同步下1.56 μm束縛光固子對可有兩種不同的型式,是因其與1.03 μm脈衝間不同的相對位置所引入的相位調變型式有關。
In this thesis, we investigate the cross-phase modulation (XPM) effect in the passively synchronized two-color mode-locked fiber lasers when the pulse walk-off effect is taken into account. The two-color mode-locked fiber lasers are the cavity-combined Er-fiber and Yb-fiber lasers, in which the 1.56 μm and 1.03 μm pulses can achieve the passive synchronization of pulse repetition rates via the XPM effect during the copropagation. We have measured the relative position between the two-color pulses along the shared fiber section such that the pulse walk-off effect can be identified, and the frequency shifts introduced by the XPM effect can be evaluated with the known pulse walk-off effect. We have also measured the relationship between the relative position and the cavity mismatch detuning. The experimental results show that the change of the frequency shift estimated from the relative position is in agreement with the variation of the pulse’s center wavelength observed in the optical spectrum. Therefore the underlying mechanisms in the passive synchronization can be identified clearly in our two-color fiber lasers with the pulse walk-off effect. In addition, the bound soliton pairs are found to exhibit two different dynamical behaviors, i.e., phase-locked (in-phase) as well as non-phase-locked. These two distinct characteristics of the bound soliton pairs are due to the different curves of the cross-phase modulation introduced by the copropagating 1.03 μm pulse.
目錄
中文摘要 i
英文摘要 ii
致謝 iii
目錄 iv
圖目錄 vi
表目錄 ix
第一章 緒論 1
1.1 研究背景 1
1.2 研究動機 3
1.3 論文大綱 4
第二章 實驗原理 6
2.1 被動鎖模與偏振疊加波鎖模 6
2.2 群速度色散與色散補償 7
2.3 不同鎖模區域的脈衝特性 11
2.4 自相關儀與交互相關儀 14
2.5 考慮脈衝走離效應下的頻率位移 18
第三章 實驗架構 21
3.1 被動同步雙色鎖模光纖雷射 21
3.2 交互相關儀 27
第四章 實驗結果與討論 30
4.1 雙色鎖模光纖雷射的同步與脈衝能量 30
4.2 測量群速度的差異 32
4.2.1 在HI 1060光纖中傳播 32
4.2.2 在OFS 980光纖中傳播 41
4.3 中心波長位移與交互相關軌跡相對位置的關係 45
4.4 1.03 μm單一脈衝與1.56 μm雙脈衝束縛態之被動同步 48
4.5 實驗結果討論 55
4.5.1 走離效應對交互相位調變的影響 55
4.5.2 以雙色脈衝相對位置與共振腔長微調之關係探討被動同步的機制 57
4.5.3 在被動同步下的束縛光固子對 59
第五章 結論與未來展望 60
5.1 結論 60
5.2 未來展望 61
參考文獻 63

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