Iterative reconstruction of diffraction limited digital holography

Zhengzhong Huang; Liangcai Cao

doi:10.1117/12.2593606

20 June 2021 Iterative reconstruction of diffraction limited digital holography

Zhengzhong Huang, Liangcai Cao

Proceedings Volume 11786, Optical Methods for Inspection, Characterization, and Imaging of Biomaterials V; 117860Q (2021) https://doi.org/10.1117/12.2593606
Event: SPIE Optical Metrology, 2021, Online Only

Abstract

Digital holographic imaging has the characteristics of fast and flexible with simple set up, and it can quantitatively obtain the intensity and phase of objects. The resolution of the reconstructed image is greatly limited by the pixelated imaging detectors during the digitization processing of holograms. Due to the limited diffraction bandwidth, the diffracted beam of each object point can be viewed as a diffractive cone. The lack of diffraction components causes the reconstructed quality to decrease when the detector cannot collect a complete diffracted wave field in the inline holography. In this work, we studied the reconstructed quality of holograms under different sampling forms. The losing diffraction components can be reconstructed by using an iterative algorithm based on energy attenuation and support constraints. We propose three iterative methods. The first is the bicubic interpolation and extrapolation iterative method based on a single small detector. The second is multi-plane extrapolation iterative method. The third is a faithful iterative reconstruction based on a sparse sensor array. When the diffraction component recorded by the hologram is missing, the losing diffraction components can be reconstructed by using the principle of the holographic redundancy. The reduction of reconstruction quality caused by the loss of sampling in the small-sized detector and sparse sensor array in the digital holography can be compensated.

Citation Download Citation

Zhengzhong Huang and Liangcai Cao "Iterative reconstruction of diffraction limited digital holography", Proc. SPIE 11786, Optical Methods for Inspection, Characterization, and Imaging of Biomaterials V, 117860Q (20 June 2021); https://doi.org/10.1117/12.2593606

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