离轴数字全息超分辨率记录系统优化设计

Optimization Design of Off-Axis Digital Holography Super-Resolution Recording System

超分辨率数字全息记录系统可以突破系统分辨极限,提高系统分辨率。设计不同形式的超分辨率记录系统用CCD记录高频物光信息是目前一个活跃的研究领域。基于取样定理及衍射的角谱理论对超分辨率离轴数字全息记录系统的设计进行研究,研究表明,无论选择何种设计方案,超分辨率系统所形成的等效CCD的面阵尺寸存在一个优化值,当实际设计尺寸大于优化值时并不能进一步提高分辨率,使用优化值设计的记录系统最紧凑。基于研究结果,导出优化设计超分辨率离轴数字全息系统的方法,以分辨率测试板为物体,使用数字全息再现光场复振幅叠加的方法,给出不同等效CCD尺寸时的重建像。实验结果证明了理论分析的正确性及可行性。

Super-resolution digital holography recording system can break through the limit of system resolution and improve the resolution of system. At present, in order to get high spectrum of object with CCD, designing different super-resolution recording system is an active area of research. Basing on sampling theorem and angular spectrum diffraction theory, the design of super-resolution digital holography recording system is discussed. The research result show that no matter how to design the system, the recording system have a optimization size value of the equivalent CCD. The resolution can not be improved when the equivalent CCD size is large than the optimization value. Based on the research result,the optimized design method of super-resolution recording system is presented. With the numerical reconstructed complex amplitude superposition method, the reconstruction images of different equivalent CCD sizes are presented. The experimental result is consistent with the theoretical analysis.