新型高效率、低截止频率角选择近场滤波研究

项目名称： 新型高效率、低截止频率角选择近场滤波研究

项目编号： No.61275140

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： 张翔

作者单位： 苏州大学

项目金额： 86万元

中文摘要： 本项目通过物理学、材料科学与信息科学等学科的交叉与融合，开展基于体布拉格光栅的角选择近场滤波与光束控制研究。采用耦合波理论分析体布拉格光栅的角度选择特性，建立角选择近场滤波的理论模型，讨论角选择滤波与体布拉格光栅的光栅厚度、折射率调制度等参数的关系；开展角选择近场滤波实验研究，明晰近场滤波系统的输出效率、截止频率和低频损耗率等关键性能与布拉格光栅器件参数的关系，采用近场对比度、桶中功率比、功率谱密度等参数评价角选择滤波光束质量；结合面结构光栅与棱镜，开展近场滤波系统的"即插即用"理论模拟与实验研究；开展基于体布拉格光栅的角选择滤波效率与偏振依赖特性研究以及输出光束的波前特性研究。本课题无疑将开拓微纳光学、新型激光器件和激光技术交叉应用研究的一个新领域，不仅在微纳光学器件发展方面具有重要意义，而且在先进激光科学技术、光学观测等高新技术领域具有重要的实用价值。

中文关键词： 体布拉格光栅；光栅结构参数技术；新型角选择滤波器；偏振特性；波前优化

英文摘要： This project mainly focuses on the investigation of the near-filed angular filtering and beam control based on volume Bragg gratings (VBGs) through the combination and intersection of physics, laser technology, information science and other disciplines. The angular selectivity of VBGs is analyzed and the theoretical model of near-field angular filtering will be built with the coupled wave theory. The dependence of angular filtering with angular selectivity of VBGs,the grating thickness, refractive index modulation or other grating parameters will be discussed. The angular filtering experiments will be built, and used to studied the dependence of filtering efficiency, cutoff frequency, rate of low-frequency loss and other performances of near-field angular filtering with Bragg grating device parameters, such as angular selectivity, grating period, grating thickness and refractive index modulation, etc. The near-filed contrast ratio, power ratio in the bucket and power spectral density (PSD) will be used to evaluate the filtered beam quality and characteristics. Combined with the surface diffraction gratings and prisms, the "plug and play" operation mode for angular filtering will be simulated and experimental studied. Besides, angular filtering efficiency based on Bragg gratings with the polarization properties w

英文关键词： Volume Bragg grating；Designing technology of structural parameters；New angular filtering；Polarization characteristics；Wavefront optimization