Review on the State-of-the-Art Technologies for Acquisition and Display of Digital Holograms

Abstract

Optical holography for recording threedimensional (3-D) scenes can be traced back to the early sixties. Since then, the art of holography has been applied in many areas, primarily as a tool for 3-D imaging, processing, and display. Extension of optical holography to other disciplines, such as optical computing and encryption, has been explored, but the scope of development is relatively limited. However, with the rapid advancements in electronics, computing, and material science technologies, most of the optical processes can be substituted with numerical or digital hardware means, thus leading to the emergence of digital holography. A typical digital holography framework can be encapsulated into three major stages, namely the input, processing, and output stages. The input and output stages are gatekeepers connecting the optical and digital worlds, without which the study on digital holography could only be restricted to theoretical and numerical analysis. In the past few decades, numerous research works have been conducted on these two important areas. In this paper, we shall provide a review on the recent development in these two important areas of digital holography. Selected pieces of important and popular works on the acquisition and display of digital holograms will be reported.Index Terms-Computer-generated holography (CGH), digital holography (DH), hologram acquisition, hologram display.

Digital holography data compression

“…Other methods are based on the acquisition of two interferograms and are named two steps or quadrature phase shifting holography methods [46].…”

Simple complex amplitude encoding of a phase-only hologram using binarized amplitude

“…However, the commonly-available SLMs display either only the amplitude or the phase of a complex amplitude, which degrades of the reconstruction quality. Using two SLMs can theoretically display a perfect complex amplitude [5,6], but requires the precise alignment with the sub-pixel accuracy, resulting to a more complicated optical setup. Moreover, the desired light with complex amplitude is obtained when amplitude holograms are displayed on amplitude-modulated SLMs, but with the unwanted lights (the direct and conjugate lights) being simultaneously reconstructed and superposing each other.…”

P‐90: Image Enhancement of 3D Holographic Head‐Up Display Using Multi‐Constraints Angular Spectrum Algorithm

“…It is calculated by computer to reconstruct the desired diffractive image. Comparatively speaking, CGH realized by phase modulation has much better performance and development, because it has no disturbance from the conjugate image and a higher diffraction efficiency which leads to higher image contrast [2].…”