像面滤波技术在无透镜傅里叶变换数字全息中的应用

无透镜傅里叶变换数字全息波前重建主要采用全息图的一次快速傅里叶变换方法,重建图像不能充分占有重建平面.本文基于像平面滤波技术,提出对物体局部区域光波场进行放大重建并让重建图像布满重建平面的方法,给出具有精细结构物体的数字全息波前重建实例.此外,将数字全息光波场重建视为具有方形出射光瞳的光学系统的相干光成像过程,导出了物体放大图像的分辨率与光学系统相关参量的关系,并通过实验给予证明.

Application of Image Plane Filtering Technique in Lensless Fourier Transform Digital Holography

A fast Fourier transform method is mainly used in the digital holographic wavefront reconstruction of lensless Fourier transform, but the reconstructed image will not fully lie in the reconstructed area. Based on the recent image plane filtering technique, a method used for enlarge reconstructing object local area wavefield is proposed and the method allows the reconstructed image fully lie in the reconstructed area. Moreover, a digital holographic wavefront reconstruction example of object with fine structure is also given. Additionally, regard the digital holographic wavefield reconstruction as a coherent imaging process of an optical system which has a square exit pupil, we can derive the relationship between the resolution of object enlarged image and the optical system parameters. Finally, experimental results confirm the suitability of the proposed method.