Studying the Recent Improvements in Holograms for Three-Dimensional Display (original) (raw)

A Study on Advances in Creating 3D Holographic Images and Optical Applications of Holography

2013

Nowadays, the most beautiful 3D pictures and movies are created by means of holograms. The most advantage of this technique is the possibility to observe 3D images without using glasses. The quality of created images by this method has surprised everyone. In this paper, the experimental steps of making a transmission hologram have been mentioned. In what follows, current advances of this science-art will be discussed. In another section of this paper the optical application of holography has been reviewed. Finally, the predictions for the future of holography have also been studied. .

Experimental investigation of holographic 3DTV approach

2009

A digital hologram is recorded by a 2D CCD array by superposition of the wavefield reflected or scattered from a scene and a coherent reference wave. If the recorded digital hologram is fed to a spatial light modulator (SLM) and this is illuminated by the reference wave, then the whole original wavefield can be reconstructed. The reconstructed wavefield contains phase and intensity distributions, which means it is full 3D, exhibiting such effects as depth and parallax. Therefore, the concept of digital holography is a promising approach to 3D-TV. In one of our previous works the preliminaries of an all-digital-holographic approach to 3D-TV were given. Here one of our approaches is experimentally verified and its capabilities and limitations are investigated.

Holographic video : design and implementation of a display system

1989

A 3-D holographic video system is described. The work on the system to date is detailed. Emphasis is placed on the efforts of the past academic year (1988-89). These efforts were focused around improving the quality of the output medium, commonly referred to as the holographic television set. Acknowledgments Without the following people this document would not exist. I would like to acknowledge each one of them for their help: Stephen Benton for his advice, concern, and wonderful anecdotes, but especially for teaching me more than even he probably realizes. Pierre St. Hilaire for a great deal of help on the project and for being a great friend. John "Pasteurizer" Under-koffler for all of the input images, eloquent words and Mahler. Joel Kollin for his incredible persistence and help. William Parker for insight and the ability to make everything appear within one's grasp. Julie Walker for holding everything together and teaching me so much about it all. Mike Halle for a...

Brief Survey on Three-Dimensional Displays : from Our Eyes to Electronic Hologram

2003

In this paper, a brief survey on three-dimensional display technologies is reported. The survey starts from the basic consideration on how a human visual system can perceive depth, as the missing dimensional component, from two-dimensional planar images. As these visual depth cues have been identified, efforts are directed to construct displays that are able accommodate as many cues as possible. Numerous displays have been built in this respect, however, only two are presented in this paper: lenticular sheet and parallax barrier. This approach, however, does not comprehensively solve the problem since these apparatus can not reproduce the original object wavefront that contains phase of the wave within which the information of object’s spatial location is embodied. Holography, conceived for the first time in 1948, is able to fulfill this necessity, and it is the main reason up to now holography remains considered as the only true threedimensional display. The remaining part of this ...

3D displays: toward holographic video displays of 3D images

Chinese Optics Letters, 2013

As the flat panel displays (Liquid Crystal Displays, AMOLED, etc.) reach near perfection in their viewing qualities and display areas, it is natural to seek the next level of displays, including 3D displays. There is a strong surge in 3D liquid crystal displays as a result of the successful movie Avatar. Most of these 3D displays involve the employment of special glasses that allow one view perspective for each of the eyes to achieve a depth perception. Such displays are not real 3D displays. In fact, these displays can only provide one viewing perspective for all viewers, regardless of the viewer's position. In addition, a fundamental viewing problem of focusing and accommodation exist that can lead to discomfort and fatigue for many viewers. In this paper, the authors review the current status of stereoscopic 3D displays and their problems. The authors will also discuss the possibility of using flat panels for the display of both phase and intensity of video image information, leading to the ultimate display of 3D holographic video images. Many of the fundamental issues and limitations will be presented and discussed.

An updatable holographic three-dimensional display

Nature, 2008

Holographic three-dimensional (3D) displays 1,2 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 3 use photopolymers that lack image-updating capability, resulting in restricted use and high cost. Photorefractive polymers 4-9 are dynamic holographic recording materials that allow updating of images and have a wide range of applications, including optical correlation 10 , imaging through scattering media 11 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 3 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.

New approaches to holographic video

Holographics International '92, 1993

Recent advances in both the computation and display of holographic images have enabled several firsts. Interactive display of images is now possible using the bipolar intensity computation method and a fast look-up table approach to fringe pattern generation. Full-color images have been generated by computing and displaying three color component images (red, green, and blue). Using parallelism to scale up the first generation system, images as large as 80 mm in all three dimensions have been displayed. The combination of multi-channel acousto-optic modulators and fast horizontal scanning continue to provide the basis of an effective real-time holographic display system.

A Technique for Producing Wide-Angle Holographic Displays

Applied Optics, 1970

A new technique has been devised for recording and reconstructing holograms which can be viewed from a wide range of angles simultaneously by a large number of people. The problems which arise through the use of this technique have been analyzed and the limitations delineated. Satisfactory wide angle, three-dimensional displays have been constructed in the manner described by using absorption holograms. The features of these holographic displays agree qualitatively with the predicted theoretical limitations.