Experimental evaluation of a full-color compact lensless holographic display

Abstract

An iterative phase retrieval method for a lensless color holographic display using a single light modulator is experimentally validated. The technique involves iterative calculation of a three-plane synthetic hologram which is displayed on a SLM simultaneously lit with three laser beams providing an RGB illumination. Static and animated two-dimensional flicker-free full color images are reconstructed at a fixed position and captured using a high resolution CMOS sensor. The image finesse, color fidelity, contrast ratio and influence of speckles are evaluated and compared with other techniques of holographic color image encoding. The results indicate the technique superior in a case of full-color real-life pictures which are correctly displayed by this ultra-compact and simple projection setup.

Numerical investigation of zoomable holographic projection without a zoom lens

“…When we select the amplitude hologram, we need to use an amplitude‐type SLM, such as amplitude‐modulated LCD, a digital mirror device, and so on. Otherwise, we need to use a phase‐type SLM, such as a phase‐modulated LCD …”

“…Time‐division methods use red, green, and blue reference lights, and one LCD panel in sequence. Unlike the time‐division methods, other methods using one SLM, which allows us to record RGB color information on one hologram, have been proposed …”

Intermediate Holographic Data Storage System by Using Sequentially Superimposed Recording

“…Holography is very useful and interesting technology in many optical areas such as optical components [1], display [2,3], microscopy [4,5] and so on. Also, holographic storage technology is one of the most extensively studied mass storage technologies in recent years because of the extended internet usage, the development of three dimensional display systems, and therefore the great demand for mass storage systems.…”

Design of multi-frequency acoustic kinoforms

“…The focal distance of kinoforms in the nearfield scales inversely with wavelength, so different patterns are shifted into the target plane as the frequency is changed. 6 Other works have used approaches that search directly for a thickness at each position that maximises a quality-metric based on the target field for each frequency. Several methods have been used to solve this optimisation problem including direct search, 7,8 optimal-rotation-angle (ORA), [9][10][11] and the Yang-Gu algorithm for phase retrieval.…”