An updatable holographic three-dimensional display

Abstract

Holographic three-dimensional (3D) displays provide realistic images without the need for special eyewear, making them valuable tools for applications that require situational awareness, such as medical, industrial and military imaging. Currently commercially available holographic 3D displays use photopolymers that lack image-updating capability, resulting in restricted use and high cost. Photorefractive polymers are dynamic holographic recording materials that allow updating of images and have a wide range of applications, including optical correlation, imaging through scattering media and optical communication. To be suitable for 3D displays, photorefractive polymers need to have nearly 100% diffraction efficiency, fast writing time, hours of image persistence, rapid erasure, and large area-a combination of properties that has not been shown before. Here, we report an updatable holographic 3D display based on photorefractive polymers with such properties, capable of recording and displaying new images every few minutes. This is the largest photorefractive 3D display to date (4 x 4 inches in size); it can be recorded within a few minutes, viewed for several hours without the need for refreshing, and can be completely erased and updated with new images when desired.

Arrays of Lucius microprisms for directional allocation of light and autostereoscopic three-dimensional displays

“…Autostereoscopic 3D display. The ability of the Lucius prism array to directionally allocate the incident light intensity suggests its use in various optical devices [18][19][20][21][22][23][24][25][26] , such as dual-view or autostereoscopic 3D display [27][28][29][30][31] . To perceive a 3D image, human eyes must see different views (binocular disparity), allowing for the sensation of depth known as stereopsis after complicated processing in the brain 29 .…”

Holographic 3-D Displays - Electro-holography within the Grasp of Commercialization

“…But even volumetric displays that create light spots somewhere within their volume are called in many cases 'holographic'. On the other hand, truly holographic recordings are being called displays, whereas there are in fact static holograms or dynamic holograms, which are not yet real-time capable with rewriting-times in the minute range and with large-scale setups (Tay et al, 2008). What we mean with real-time holographic displays are systems that are based on diffraction to reconstruct the wave field of a 3-D scene in space with coherent light.…”

Molecular design of photorefractive polymers

“…Peyghambarian's group at the University of Arizona, USA, demonstrated the development of updatable 3D holographic displays using a combination of a PR polymer device and a holographic stereogram technique. [122][123][124][125] They succeeded in developing a long-persistence updatable hologram system, which could be viewed for minutes to hours by controlling the T g of the PR polymer device. They recorded 100 hogels for 2-4 min using a holographic stereographic technique to reconstruct a monochromatic hologram, which could be observed for 3 h on a 100 mm × 100 mm PR device consisting of PATPD-CAAN/ FDCST/ECZ (50/30/20 by wt.).…”

“…They recorded 100 hogels for 2-4 min using a holographic stereographic technique to reconstruct a monochromatic hologram, which could be observed for 3 h on a 100 mm × 100 mm PR device consisting of PATPD-CAAN/ FDCST/ECZ (50/30/20 by wt.). 122,123 By using a pulse laser with a duration time of 6 ns that delivered 200 mJ per pulse at a repetition rate of 50 Hz, 100 hogels were recorded for 2 s to reconstruct multicolor holograms on a 300 mm diameter PR device consisting of PATPD-CAAN/FDCST/ECZ/PCBM (49.5/30/20/0.5 by wt.). 124 The hologram had a brightness of 2500 cd m − 2 , reduced laser power of 20 mW CW laser, and reported an improvement in resolution and a three-color hologram.…”