项目名称: 铁电畴结构高精度高分辨率实时动态三维检测新方法研究
项目编号: No.61275110
项目类型: 面上项目
立项/批准年度: 2013
项目学科: 无线电电子学、电信技术
项目作者: 职亚楠
作者单位: 中国科学院上海光学精密机械研究所
项目金额: 82万元
中文摘要: 铁电畴工程广泛用于准相位匹配非线性光学、电光扫描器和电光开关等领域,成为近年来铁电研究的热点。畴反转结构检测方法的研究已经成为铁电畴工程研究的重要组成部分,开展畴反转结构的高精度高分辨率实时动态三维检测具有重大的理论意义和工程应用价值,然而目前的检测技术均无法满足要求。本项目以获取铌酸锂和钽酸锂晶体畴反转实时动态过程的三维信息为目标,提出一种基于声光频移的畴结构检测方法,以雅敏干涉平板为主体,采用直接数字频率合成技术驱动声光偏转器,实现干涉条纹的高速变频,辅以显微技术,采用改进的时域相位解包裹技术克服现有数字全息干涉术不足,使检测范围不受晶体厚度和畴反转纵向深度的限制,具有更高的纵向检测精度和横向分辨率,纵向精度达到毫弧量级,横向分辨率达到亚微米量级,应用于实时检测和控制,制作优良的周期反转畴结构。本项目技术的实现对畴反转物理机制的深入研究和铁电畴工程的未来发展具有重要理论意义和应用价值
中文关键词: 铁电畴工程;三维成像;剪切干涉;数字全息;超分辨成像
英文摘要: Ferroelectric domain engineering has been extensively exploited for various quasi-phase-matched (QPM) nonlinear applications, electro-optical scanner and electro-optical switch, and has become the focus of ferroelectric research. As one of the most important parts, the real-time dynamic three-dimensional (3D) detection of domain structure with high precision and high resolution has the great significance and value for the theoretical investigation and domain engineering application. However, the exciting technique cannot meet the demand. This project suggests a new detection method of domain structure based on acoustooptic frequency shift in order to acquire the real-time dynamic three-dimensional information during domain inversion in LiNbO3 and LiTaO3. With the Jamin plates as the main structure, the system uses the Direct Digital Synthesize (DDS) technology to drive the acousto-optic deflector in order to realize the high-speed switch of fringe frequency. At the same time, the microscope technology is also used to enhance the lateral resolutions of testing system. In this case, the real-time 3D detecting of domain inversion can be carried out. In addition, the improved time-domain phase-unwrapping technology can be adopted to overcome the shortcomings of present digital holography so that the proposed method
英文关键词: domain engineering;three-dimensional imaging;shearing interferometer;digital holography;super-resolution imaging