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博碩士論文 etd-0814116-011016 詳細資訊
Title page for etd-0814116-011016
論文名稱
Title
利用扭轉向列型液晶製作雙向出光偏振不對稱之隨機雷射
Polarization-Asymmetric Bidirectional Random Laser Emission from a Twisted–Nematic Liquid Crystal
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
51
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
2016-08-23
繳交日期
Date of Submission
2016-09-23
關鍵字
Keywords
染料、隨機雷射、臨界值反轉、偏振不對稱、扭轉向列型液晶
threshold inversion, asymmetric polarization, twisted nematic liquid crystal, dye, random lasing
統計
Statistics
本論文已被瀏覽 5689 次,被下載 69
The thesis/dissertation has been browsed 5689 times, has been downloaded 69 times.
中文摘要
本研究探討以摻雜染料之扭轉向列型液晶作為散射介質所產生之偏振不對稱的隨機雷射現象。扭轉向列型液晶除了作為將光侷限的散射結構外,同時也扮演著偏振旋轉器的角色,使產生的隨機雷射在離開液晶結構前,其偏振會順著液晶分子長軸的指向旋轉,最終出光偏振平行於出射面液晶分子長軸,即基板表面配向方向。
本實驗首先利用光譜檢驗雷射模態的穩定度以及電場對雷射的調控性。接著,利用不同夾角的扭轉向列型液晶樣本驗證其雙向出光偏振的不對稱性取決於基板表面的配向方向。最後,我們也從染料濃度、激發光偏振方向及樣本厚度等觀點來探討雷射臨界值的變化,並且發現了「臨界值反轉」此一預料之外的現象。
Abstract
In this study, we reports on the observation and detailed investigation of the bidirectional random lasing emitted from a dye-doped twisted nematic liquid crystal, of which the polarization states are asymmetric (non-parallel to each other). In such a device, the liquid crystal can be regarded as a random distributed feedback laser cavity with an inherently built-in polarization rotator. While propagating in the laser cavity, the polarizations of the dye-emitted light will follow the gently twisted director axis. The output polarization states are, therefore, parallel to each of the surface alignment directions. The mode stability and electrical switchability of the laser were also examined. Moreover, a clear correlation between the lasing threshold, alignment direction, and dye concentration was established. The findings not only suggest an optimum concentration for low-threshold operations, but also reveal an unforeseen behavior — threshold inversion.
目次 Table of Contents
摘要 i
Abstract ii
目錄 iii
圖目錄 iv
表目錄 vi
第一章 緒論 1
第二章 液晶介紹 2
2.1 何謂液晶 2
2.2 液晶的分類 2
2.3 液晶的物理特性 6
第三章 理論介紹 12
3.1 扭轉向列型液晶介紹 12
3.2 雷射原理 17
3.3 隨機雷射原理 18
3.4 液晶隨機雷射 20
3.5 二色性染料 20
3.6 賓主效應 21
第四章 實驗方法與過程 22
4.1 材料介紹 22
4.2 樣本製備 23
4.3 實驗量測架設 26
第五章 結果與討論 29
5.1 摻雜雷射染料之TN液晶隨機雷射光譜量測 29
5.2 摻雜雷射染料之TN液晶隨機雷射偏振量測分析 31
5.3 摻雜雷射染料之TN液晶隨機雷射臨界值分析 32
第六章 結論與未來展望 39
參考文獻 41
參考文獻 References
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