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博碩士論文 etd-1011107-220446 詳細資訊
Title page for etd-1011107-220446
論文名稱
Title
飽和布拉格反射鏡脈衝整形效應與慢光特性之研究
A Study of Pulse Shaping and Slow Light Properties in Strained Saturable Bragg Reflector
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
73
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2007-10-08
繳交日期
Date of Submission
2007-10-11
關鍵字
Keywords
慢光、脈衝整形、飽和布拉格反射鏡
SSBR, pulse shaper, slow light
統計
Statistics
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中文摘要
在本論文中,我們利用脈衝整形技術研究飽和布拉格反射鏡(strained saturable Bragg reflector, SSBR)的色散響應與慢光特性。在色散響應的研究部份,我們模擬飽和布拉格反射鏡對不同啾頻量的光脈衝的色散響應,並以此驗證文獻實驗數據的結果,在驅勢上得到與實驗數據具有一致性,因此更能確定飽和布拉格反射鏡對具色散量的脈衝有致寬或壓縮能力,其中脈衝壓縮的能力有助於雷射共振腔的鎖模起動且所形成脈衝寬度也會較窄。而在慢光特性研究上,我們自行架設了脈衝整形系統(pulse shaper)以及交互相關儀系統(cross-correlator),利用脈衝整型系統對光脈衝進行啾頻控制,再將光脈衝打在飽和布拉格反射鏡上,以交互相關儀量測其在時域上的分佈,從而研究飽和布拉格反射鏡的慢光特性。我們已觀察到飽和布拉格反射鏡的慢光現象出現在入射波長共振的波段,且在啾頻控制方面,正啾頻入射脈衝的光速比負啾頻入射還慢,在這裡推論是因為吸收增加且載子散射的影響變小的原因。此外,我們也研究在不同入射啾頻不同入射功率下的慢光特性,發現當入射功率增加時,慢光現象愈顯著,且當入射功率超過飽和布拉格反射鏡的飽和點時,光速會明顯的變慢。
Abstract
In this thesis, we studied chirp response and slow light properties in strained saturable Bragg reflector (SSBR). In the part of chirp response studying, we simulated the chirp response of SSBR of pulses with different chirps, and verified the results of related work. The trend of simulation was consistent with experimental result. Therefore firmly believing the broadening or compression ability of chirped incident pulse in SSBR, the pulse compression ability facilitates the mode-locking in laser cavity and generates more narrow pulse. In the studying of slow light properties in SSBR, a home-made pulse shaper system and a cross-correlator system were demonstrated. We control the chirp of the pulse by pulse shaper, and then pulse enter SSBR and reflect from SSBR, and measure the signal distribution in time domain by cross-correlator, finally we can analyze the properties of slow light of SSBR. We have demonstrated the slow light phenomenon was observed as central wavelength of incident pulse approach to resonance absorption of SSBR. In the aspect of chirp control, contrast with negative chirped incident pulse, slower group velocity with larger group delay for positive chirped incident pulse was observed. This could be attributing to absorption increasing which result from more efficient for creating carrier and less-sensitive to the carrier-scattering effect. In addition, we further study power dependence of slow light properties in SSBR under various incident chirps. Increasing group delay with power of incident pulse was performed. In addition, more group delay under saturation was also characterized and analyzed.
目次 Table of Contents
目錄 頁碼
中文摘要 II
英文摘要 III
致謝 IV
目錄 V
圖表目錄 VII
第一章 緒論..................................................1
第二章 光脈衝整形技術原理.............................4
2.1節:脈衝整形原理.................................5
2.2節:脈衝整形系統架構與空間光調制器..........7
2.3節:相位凍結演算法..........................13
2.4節:慢光原理概述............................19
第三章 飽和布拉格反射鏡介紹...........................24
3.1節:飽和布拉格反射鏡簡介....................25
3.2節:飽和布拉格反射鏡的脈衝整形因數..........30
3.3節:飽和布拉格反射鏡脈衝整形因數的理論分
析模擬..................................33
第四章 利用脈衝整形技術對飽和布拉格反射鏡的慢光特性研究
4.1節:雷射系統................................41
4.2節:實驗架構................................42
4.3節:實驗結果與討論..........................46
第五章 結論與未來展望.................................62
參考文獻...............................................63
參考文獻 References
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