Improvement of the image quality of random phase--free holography using an iterative method

TL;DR

This paper introduces an iterative, random phase-free holography method using virtual convergence light, enabling large, low-noise reconstructed images without random phase, but with some quality degradation at low resolutions.

Contribution

It presents a novel iterative approach that improves image quality in random phase-free holography by incorporating virtual convergence light, especially for low-resolution holograms.

Findings

Large reconstructed images exceeding hologram size

Low-speckle noise in amplitude and phase holograms

Degraded image quality in low-resolution holograms

Abstract

Our proposed method of random phase-free holography using virtual convergence light can obtain large reconstructed images exceeding the size of the hologram, without the assistance of random phase. The reconstructed images have low-speckle noise in the amplitude and phase-only holograms (kinoforms); however, in low-resolution holograms, we obtain a degraded image quality compared to the original image. We propose an iterative random phase-free method with virtual convergence light to address this problem.