基于纯相位空间光调试器的超高性能光束控制系统的性能研究

项目名称： 基于纯相位空间光调试器的超高性能光束控制系统的性能研究

项目编号： No.61307077

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 张紫辰

作者单位： 清华大学

项目金额： 28万元

中文摘要： 超高精度光束控制系统在高精度机械加工、自由空间光通信系统、光纤连接器、激光显示和图像处理等方面具有非常重要的研究意义。本项目创新性地提出利用光衍射理论和电信号控制双折率的向列型液晶材料的光电特性，以纯相控式硅基液晶器件为光学引擎，通过加载高精度位相光栅改变光线传播方向的方式实现超高精度的光束控制。具体研究内容包括：第一、研究纯相位式硅基液晶器件中液晶层的空间分布与光束控制系统的精度和光衍射效率关系；第二、研究光学空间相位补偿方法，对器件液晶层空间分布不均一性进行优化，以求提高光束控制系统的衍射效率和光束控制精度；第三、研究液晶材料的光电属性与硅基液晶背板的驱动方式，提出加速光束控制系统响应速度的方法。本项目从硅基液晶器件和液晶材料光电特性的角度出发对超高精度光束控制系统的性能进行定量分析，研究结果对以"纯相控式硅基液晶器件"为核心的激光通信、精密仪器测量和矫正等基础工业具有重要的科学意义。

中文关键词： 硅基液晶技术；液晶材料；非机械光束扫描；衍射效率；光控系统的精度

英文摘要： High precision laser beam steering is a very important topic, with applications of ultra-high precision manufacturing, free-space telecommunications system, fiber optic connectors, laser display and imaging process. Based on the diffraction theory and electrically controlled birefringence of the liquid crystal material electro-optic effect, the phase-only nematic liquid crystal on silicon device (LCOS) is to be used as an optical engine in this project to demonstrate the optical performance (steering resolution and diffraction efficiency) of the beam steering system by loading high precision gratings. First, the relationship between the resolution of beam steering and the distribution of liquid crystal in the phase-only nematic LCOS device is investigated; second, in order to improve the diffraction efficiency and the resolution of the beam steering system to the theoretical, a spatial phase grating compensation is proposed to optically optimize the space distribution of liquid crystal layer in the LCOS device; third, based on the characterization of nematic liquid crystal material and driving scheme of the phase-only nematic LCOS device, the development of dynamic response for the beam steering system is presented. In this project, the characterization for the performance of beam steering system is quantitative

英文关键词： Liquid crystal on silicon technology；liquid crystal materials；non-mechanical beam steering system；diffraction efficiency；resolution of beam steering system