可实现激光扫描的液晶闪耀光栅的设计与研究

【作者】 刘坤；

【导师】 黄子强；

【作者基本信息】 电子科技大学 ， 光学工程， 2010， 硕士

【摘要】 闪耀光栅可以将光束能量集中到某一特定的闪耀级次上,但普通闪耀光栅一经制成其光栅常数及闪耀角便确定下来。利用液晶在电场的作用下光学性质得到改变的特性,液晶闪耀光栅可以通过编程控制灵活改变光栅常数及闪耀角,从而与光束扫描技术很好的结合起来,有望成为一种体积小、重量轻、功耗低、无机械转动、响应速度快的光束扫描器,能够应用于光开关、投影显示、空间光通信、光学加工、目标探测、激光雷达等广泛的领域,成为国际上研究的热点。但是受器件制作工艺水平的限制,目前国内的研究多处于理论阶段,对液晶闪耀光栅制作工艺的研究就显得非常重要。本文依托具体的科研项目,针对液晶闪耀光栅的研制开展了如下工作:1)建立并分析理论模型基于衍射光学理论和二元光学原理,结合液晶的连续弹性体理论及电控双折射效应,建立液晶闪耀光栅的理论模型,分析液晶闪耀光栅的偏转特性及衍射效率;2)制定实施方案分析液晶闪耀光栅的设计要点,根据具体要求与技术指标形成可行的实施方案,明确器件研制的努力方向;3)关键制作工艺的研究与实现对于器件制作中的关键工艺,选择合适的加工手段,根据理论指导,通过实验研究获得其恰当的工艺参数,不断总结经验,提高制作工艺水平,对于实际中可能遇到的问题,进行深入研究和探讨,力争制作出与设计方案一致的器件;4)器件效果及性能测试对制作完成的器件进行一系列测试,验证器件理论模型的准确性,检验器件制作的可靠性,对器件的制作工艺水平进行定量评价,以指导制作工艺的优化方向;5)提出优化方案分析可能存在的问题,提出优化解决的方案,为器件的不断改进奠定基础。更多还原

【Abstract】 Blazed grating can concentrate beam energy to a specific order, but its grating constant and the blaze angle will be determined after the blazed grating was made. With the liquid crystal characteristics that the optical properties were changeable under the electric field, liquid crystal blazed grating could flexibility change the grating periods and blaze angles by programmed control. With beam scanning technology,it was expected to become a small, light weight, low power consumption, no mechanical rotation, fast response light beam scanner, and can be used in optical switching, projection displays, optical communication, optical processing, target detection, laser radar, wide area. However, because of restrictions on the level of the device manufacturing process, the current multi-national research in theoretical, to study on the liquid crystal blazed grating fabrication process is very important.This relies on specific research projects, for liquid crystal blazed grating work carried out as follows:1) Created and analyzed theoretical modelsBased on diffraction optics and Binary optics theory, combined with the continuous elastic theory of liquid crystal and electrically controlled birefringence effect of liquid crystal blazed grating, a theoretical model was established to analyze the deflection characteristics of liquid crystal blazed grating and the diffraction efficiency;2) Developed implementation plansLiquid crystal blazed grating design elements were analyzed; a possible solution was generated according to the specific requirements and technical indicators; a clear direction for the device was developed;3) Key production process and its implementationSuitable processing means were chosen for the key device production process, according to the theoretical guidance; the appropriate process parameters were got through the experimental study, and the level of production process were improved by experience were constantly summed up; the problems that may be encountered in practice were in-depth study and exploration, and strive to produce the device consistent with the design;4) Tests of device results and performancesFinished devices were tested to verify the accuracy of the theoretical model and the reliability of the device production; the level of the device manufacturing process was quantitative appraised to guide the direction of manufacturing process optimization;5) Proposed optimization schemeAccording to the test results, possible problems were analyzed; optimal solution to the problem was proposed for the basis of continuously improvement of the devices.更多还原