Because phase is a relative property, construction of a. Abstractthis research papers examines the new technology of holographic projections. Thin sheet of reality that explains how quantum theory and gravity interact to construct the reality that we are in. Basic principles and applications of holography spie. Essentially, it claims our physical world is nothing more than a detailed illusion.
Hariharan basics of holography cambridge university press, cambridge, uk. As explained earlier the aim of this work is also the same, which is to devise a. But it had to wait for two critical inventions before its full potential was to be realized. Introduction first experiments in numerical reconstruction of optical holograms date back to 196070th. Holography is a photographic technique that records the light scattered from an object, and then presents it in a way that appears threedimensional. Full mathematical theory possible, but beyond this course. Because string theory is such a theory, some physicists believe the holographic principle will lie at the heart of it. The basic principle of holography is to create the image using two simultaneous beams of light, that interfere with each other to form a complex image on a suitable photographic film. Holography 1 holography introduction and background the aesthetic appeal and commercial usefulness of holography are both related to the ability of a hologram to store a threedimensional image. Although holograms were immediately popular for art, practical applications of optical holography lagged until the 1980s. An astonishing theory called the holographic principle holds that the universe is like a hologram.
The first, understanding holography, presents the principles of hologram recording illustrated with practical examples. It must be manifest in an underlying quantum theory of gravity. The hologram is then illuminated with laser light transmission. The holographic universe principle suggests that were living in a simulated reality. After invention of holography by dennis gabor in 1947 it is widely used in various areas. Just as chemists use sticks and balls to help them visualize the structure of molecules, our model will allow us to visualize, and thus understand, the physical characteristics of holograms without using advanced mathematics. The idea is called the holographic principle, after the way that a hologram encodes 3d information on a 2d surface. To cover the basic of holographic recording and reconstruction. It can be the interference pattern on a photographic plate from a threedimensional object, or the entropy impressed on the surface of a black hole, or a physical theory translated into another form. Optical holography didnt take off until the invention of the laser in 1960. The holographic principle isnt strictly an aspect of string theory or mtheory, but applies more generally to theories about gravity in any sort of space.
This film examines the process of holography, types of holograms, and the uses of the hologram for artistic and scientific purposes, as demonstrated by tung h. You make a hologram by reflecting a laser beam off the object you want to capture. At that time, scanning devices that could be used for digitizing. The name for the technique that was developed comes from the greek word holos, meaning whole, and gramma, meaning message. It relies on the principle of interference to produce an image. Holography, means of creating a unique photographic image without the use of a lens. This is the reason why gabor apparently abandoned holography by the mid 1950s 2.
According to the principle of holography, a detailed three dimensional image of an object can be recorded in a two dimensional photographic. But the most impressive holograms are large scale and illuminated with lasers or displayed in a darkened room with carefully directed lighting. Gabors original setup for writing the hologram is described in fig. Library journalthis comprehensive book is a guide for nontechnical people who wish to create their own holograms. Principle of holography holography works on the principles of interference and diffraction of light two step process. In fact, you split the laser beam into two separate halves by shining it through a halfmirror a piece of glass coated with a thin layer of silver so half the laser light is reflected and half passes throughsometimes called a semisilvered mirror. The most rigorous realization of the holographic principle is the adscft correspondence by juan maldacena. Holographic lens variations on holographic lens hologon headup display a p p l i e d o p tic s g r o u p d e p a r t ment o f p h y s i c s applications of holographic 1. Holography principles martin janda, ivo hanak, and vaclav skala abstract this report summarise mathematical background of the holography phenomenon along with the overview of techniques and application of the optical holography.
Babasaheb ambedkar technological university, department of information technology engineering lonere402 103 20112012 2. The development of new holography methods made it suitable for new industrial and scientific applications. Holograms which can be found on credit cards or some notes are applied on twodimensional plastic surfaces. Making holograms the easy way by fred unterseher, jeannene hansen and bob schlesinger, is rich in detail about how to produce all kinds of hologram on a limited budget. The basic principle of holography consists of the recording of the hologram by interference between the object wave and the reference wave followed by the diffraction and propagation of another reference wave resulting in the formation of the holographic image. The hologram is then illuminated with laser light transmission or white light reflection. A principle for quantum gravity progress in fundamental physics has often been driven by the recognition of a new principle, a. When two light waves pass through each other each wave acts like a bump to the other.
The interference pattern is captured by the film and processed. Learn how a hologram, light and your brain work together make clear, 3. Holography, on the other hand does not utilize a lens to form a latent image. Twistor theory was proposed by roger penrose in 1967 as a possible path to quantum gravity and has evolved into a branch of theoretical and mathematical physics. The concept of holography has lured philosophers of science for decades, and is becoming more and more popular on several. Unlike ordinary photographs, holograms record both phase and amplitude information. Dec 30, 2014 when stephen hawking elegantly described the relationship of quantum mechanics with black holes, he inadvertently opened the door to a radical possibility.
A seminar on introduction to holographyintroduction to holography presented by swapnil g. We survey some successes and challenges in implementing the holographic principle. The holography principle was immediately applied to recording and imaging by visible light 4. While plain daylight lets you see some simple holograms, true 3. The techniques and principles of holography have been modi. A holographic image can be seen looking into an illuminated holographic print by shining a laser through a hologram. It highlights the importance and need of this technology and how it represents the new wave in the future of technology and communications, the different application.
The photographic recording of the image is called a hologram, which appears to be an unrecognizable pattern of stripes and whorls but whichwhen illuminated by coherent light, as by a laser beamorganizes the light into a threedimensional representation of the original object. Basics of holography is an introduction to the subject written by a leading worker in the. Holography principles computer generated holography at the. Nevertheless, the proof of principle demonstration was performed entirely in the optical. This paper is an introduction to the holographic phenomena with a previous short recall of the light properties necessary for this matter.
Holography is the science of making holograms which are usually intended for displaying three dimensional images. Moreover, specialties of digital holography are presented. Mar 14, 2002 basics of holography is a general introduction to the subject written by a leading worker in the field. Basics of holography is a general introduction to the subject written by a leading worker in the field. Essentially, it claims our physical world is nothing more than a detailed illusion, and while this is unlikely. Sep 30, 2010 history of holography invented in 1948 by dennis gabor for use in electron microscopy, before the invention of the laser leith and upatnieks 1962 applied laser light to holography and introduced an important offaxis technique. Unlike a photograph, which records the square of the electric eld, a hologram contains both the amplitude and phase information from the image. Practical aspects of holography are then described, including light. The holographic principle thus implies that the subdivisions must stop at some level, and that the fundamental particle is a bit 1 or 0 of information. To make holography accessible to a general audience with widely varied backgrounds, a physical model is useful. Nobel prize winner dennis gabor, holographys inventor, saw the film after it was made and said it was the. History of holography invented in 1948 by dennis gabor for use in electron microscopy, before the invention of the laser leith and upatnieks 1962 applied laser light to holography and introduced an important offaxis technique. Aug 20, 2019 the holographic principle is a property of quantum gravity theories which resolves the black hole information paradox within string theory.
Holographic projectors use holograms rather than graphic images to produce projected pictures. Recently, raphael bousso, while at stanford university, helped formulate a more. In summary, inline holography can be summarized as the process of recording the fresnel diffraction pattern of the object onto a photosensitive film. Holography basic principles and contemporary applications. When light bounces off of them it creates the appearance of a threedimensional images. In fact, you split the laser beam into two separate halves by shining it through a half mirror a piece of glass coated with a thin layer of silver so half the laser light is reflected and half passes throughsometimes called a semisilvered mirror. The holographic principle asserts that its origin must lie in the number of fundamental degrees of freedom involved in a uni. Request pdf principles of holography the basic principle of holography consists of the recording of the hologram by interference between the object wave.
Another key insight into string theory comes from the holographic principle, which relates a theory in space to a theory defined only on the boundary of that space. The projected light produces bright two or threedimensional images. In this module, a physical model will be developed so that all major features of basic holography can be explained. Penrose proposed that twistor space should be the basic arena for physics from which spacetime itself should emerge. These laws are referenced many times in the text of this thesis and therefore basics of the wave optics. Of course, this first section is without interest for specialists but can give some fundamentals in optics for the other readers. It begins with the theory of holographic imaging, the characteristics of the reconstructed image, and the various types of holograms. They shine special white light or laser light onto or through holograms. The holographic principle is a property of quantum gravity theories which resolves the black hole information paradox within string theory. Holography 1 background the word hologram was coined from the greek word \holos which means whole, because the recorded hologram contains all the information of the image eld. Apr 07, 2003 the idea is called the holographic principle, after the way that a hologram encodes 3d information on a 2d surface. He named the new imaging principle holography, for its ability to record the whole optical field.
If you want to see a hologram, you dont have to look much farther than your wallet. When stephen hawking elegantly described the relationship of quantum mechanics with black holes, he inadvertently opened the door to a radical possibility. Dec 29, 2016 the holographic principle is a theory see. It is a physical structure that diffracts light into an image. When a hologram is made, a coherent beam of light is divided so that one beam the reference beam falls directly onto a piece of photographic lm and another beam the object beam is formed from the light that is scattered by an object and falls onto the same piece of lm. Holography basic principles and contemporary applications is a collection of fifteen chapters, describing the basic principles of holography and some recent innovative developments in the field. Holography is built on quite complex physical laws of optics. Holography definition of holography by the free dictionary. The holographic universe principle suggests that were living in a simulated reality this is different from the hypothesis that states we live in a computer simulation.
578 1035 1396 180 1388 588 832 607 427 740 267 820 1093 457 1476 967 1320 1015 857 293 906 1616 155 639 1265 258 828 886 1079 910 332 304 1636 375 774 313 1105 592 1293 282 564 740 243 599 401 801 539 920