利用菲涅爾型奈米尺寸之聚合物散射型液晶透鏡於減少雷射光斑

Abstract

傳統減少雷射光斑方式有好幾種，有一部分會產生不必要的震動於系統中，有一部分的系統結構較為複雜，還有另一部分會損失部分的光造成能量的損失。在這篇論文中，我們提出利用菲涅爾型奈米尺寸之聚合物散射型液晶透鏡於減少雷射光斑。此方法優點為整個系統構造較為精簡並且當元件處於減少雷射光斑的狀態時擁有較高的穿透率。此研究中，我們從設計構造和研究方法著手。接著介紹我們所使用的製程材料和製程步驟，其中包精密加工、翻模步驟、導電層之旋轉塗佈和菲涅爾型奈米尺寸之聚合物散射型液晶透鏡之組裝，各細節於論文中都予以詳細介紹。之後我們探討所設計菲涅爾型奈米尺寸之聚合物散射型液晶透鏡之特性，其中包含穿透率對電壓曲線和反應時間。最後我們利用此菲涅爾型奈米尺寸之聚合物散射型液晶透鏡於減少雷射光斑並且分析於實驗中所得到的圖片數據。

In some traditional speckle noise reduction technologies, some of them may engender unwanted vibrating because of the mechanical moving part in the system, some of them may have complicated structure, others may lose an amount of light. In this thesis, we propose Fresnel-patterned nano-sized PDLC lens to achieve speckle noise reduction, which is a liquid crystal based technology. It provides a compact way to conduct speckle noise reduction with high transparency when the film is on the working state of speckle noise reduction. In this research, we start from our design and methods. Then, we talk about materials we used, calculations of speckle noise and fabrication process, including Precision Machining, replication process, spin coating of conductive layer and assembly of nano-sized PDLC lens. After that, we investigate the characteristics of our designed nano-sized PDLC lens, including transmittance-voltage curve and response time. Finally, we utilize our Fresnel-patterned nano-sized PDLC lens for speckle noise reduction and analyze the pictures and data we got from the experiment.