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Fast phase reconstruction in off-axis digital holography with zero-order term suppression

Luan Guangyu, Shan Mingguang, Zhong Zhi, Xia Bai

Optica Applicata

2020

Vol. 50, nr 3

425--432

A fast phase reconstruction method (FPRM) employing a free-sample hologram can improve the efficiency of phase reconstruction in off-axis digital holography. However, the space-bandwidth product is still confined by spectrum aliasing in the hologram owing to the zero-order term. In this paper, we propose an FPRM that features an efficient zero-order term suppression method called the average gray that can eliminate spectrum shifting. We can implement phase reconstruction by considering both speed and the space-bandwidth product. We verified the validity of our approach for off-axis digital holography using laser and white-light illumination.