Holographic Definition and 123 Threads

Holography is a technique which enables a wavefront to be recorded and later re-constructed. Holography is best known as a method of generating three-dimensional images but it also has a wide range of other applications. In principle, it is possible to make a hologram for any type of wave.
A hologram is made by superimposing a second wavefront (normally called the reference beam) on the wavefront of interest, thereby generating an interference pattern which is recorded on a physical medium. When only the second wavefront illuminates the interference pattern, it is diffracted to recreate the original wavefront. Holograms can also be computer-generated by modelling the two wavefronts and adding them together digitally. The resulting digital image is then printed onto a suitable mask or film and illuminated by a suitable source to reconstruct the wavefront of interest.

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  1. M

    Holographic principle responsible for life?

    The holographic principle claims that physics on the surface of a sphere determines the physics inside the volume enclosed by that sphere. And in particular, the entropy calculated from the surface of the sphere limits the entropy inside the sphere. If so, then entropy per unit volume would go...
  2. C

    HVD: Holographic Versatile Disc

    Has anyone here heard about the new data storage medium that is being researched? Apparently it'll be able to store up to 3.9 terrabytes of data, which is insane. Anyway, I checked out this article on Wikipedia to see how it worked... http://en.wikipedia.org/wiki/Holographic_Discs...
  3. C

    How can we test the holographic principle and nonlocality in quantum mechanics?

    I've been reading the book The Holographic Universe: By Michael Talbot and am attempting to find evidences for his writings in this book. He does, however, list many tests and experiments that help prove his basis, but I want to find the information of reproductive experiments that will prove or...
  4. F

    Exploring Holographic Universe Theory

    Hi everyone, I am curious as to the current thinking on the concept of the holographic universe. Any insights would be appreciated. Thanks in advance. I see my post has been moved. Shall I take that to mean that the holographic universe concept is no longer considered a...
  5. T

    Holographic Principle: Entropy & Area for Observers Moving w/BH

    If the entropy, S of a black hole is proportional to the area of the horizon, A, then, what about an observer moving with a constant velocity, v with the BH? Another observer moving with a constant acceleration with respect to the BH? After all, entropy is an invariant but area is not. So...
  6. Mk

    Blu-ray vs. HD-DVD vs. Holographic

    Which would you buy? What are the pros and cons? Which do you think will come out ahead?
  7. J

    Holographic universe and werewolves/shapeshifters.possible?

    now i don't know the specifics of the theory. i obvioulsy need to read up on it again or get a book, but i did a little googling earlier to try and link the two,but came up a little short. still got some reading to go, but in the mean time. is it possible in a holographic universe, for people...
  8. DaveC426913

    Exploring the Holographic Principle

    I've finished reading Brian Greene's "Fabric of the Cosmos" and the last chapter intrigued me. He talks about how Hawking et al have proven that the maximum entropy inside a black hole is a function of the surface area of the BH, not the volume. This can be expanded to any volume of space...
  9. marcus

    Padmanabhan holographic gravity (Paris last week)

    Last week there was the Einstein Centenary conference in Paris and Padmanabhan was one of the invited speakers (with Gerard 't Hooft, Carlo Rovelli, Brian Greene, Abhay Ashtekar...) I was reading a French blogger Fabien Besnard just now, to see what of interest he had to report from the Paris...
  10. D

    Can holographic projections change your appearance?

    Would it be possible to use holographic projections to make you look like something else? I mean, for example, could you project an image onto your body (With like a hand-held projector) to make you look like a different thing?
  11. check

    Holographic projector? Any idea how it works?

    “Holographic” projector? Any idea how it works? I saw this a couple of years ago. It’s a projector that’s able to display 2D images or simulated 3D video into the air. Here’s the manufacturer’s site: http://www.io2technology.com/ The site has a few really neat videos. Any idea how this is done?
  12. R

    Exploring the Possibility of a Holographic Universe

    Holographic Me! i have a question: is there anyway that i and the world be holographic and if so please explain in scientific terms?
  13. R

    Philospphy and the holographic model (web link)

    http://www.earthportals.com/hologram.html
  14. dduardo

    How Does Holographic Memory Work

    I found this press release just yesterday and I'm curious to know how it works: http://www.optware.co.jp/english/what_040823.htm In Figure 1: -Substrate 2 is just a protective cover for the cd. -The photo polymer is the recording layer, but which wavelength(color) is actually causing...
  15. S

    And the question remains, is our Universe really a Hologram?

    the holographic universe? Greetings and Hi all =) Is there such a thing, a holographic universe? I recently stumbled upon this concept while browsing through some magazines. I would like to ask a few questions. Could someone please provide the answers to the following questions >>> What...
  16. S

    What is the Holographic Principle and its relation to information and entropy?

    Hi there.. If was wondering about the relation between information and entropy, in the following context. The way I understand Gerard 't Hoofd's holographic principle is this. We know that the entropy of a black hole is A/4. Now suppose that a volume V was found to have an excess in entropy...
  17. R

    Thoughts on holographic universe and existence in general

    holographic universe and our very existence in general... One night i was in a strange mood and wrote this... i don't really remember writing most of it... but i thought i would share with the community here and i am definately searching for any feedback on my ideas that anyone might have! I...
  18. R

    Thoughts on holographic universe and existence in general

    Thoughts on holographic universe and existence in general... One night i was in a strange mood and wrote this... i don't really remember writing most of it... but i thought i would share with the community here and i am definately searching for any feedback on my ideas that anyone might have...
  19. D

    What is the Holographic Principle and how is it related to string theory?

    Can anyone give me a basic definition of what the "Holographic Principle" is, exactly? Or care to discuss the idea at all? Thanks.
  20. W

    Is Our Universe a Three-Dimensional Hologram?

    So far I've posted this to two different bulletin boards and, despite a pretty good number of hits no one has responded. Sometimes the lack of a response is as interesting as any other possibility. :0) The latest scientific american has an interesting article online for free about recent...
  21. W

    Is the Universe a Hologram According to Quantum Mechanics Research?

    The latest scientific american has an interesting article online for free about recent research into a possible holographic interpretation of Quantum Mechanics. It's fascinating reading but conceptually deep. It seems that instead of taking the Bohmian approach of using an ad hoc modification of...
  22. M

    How does holographic dispersion create three-dimensional images?

    I have read that the interference patterns on a piece of holographic film can be cut, and any segment that is cut out will display the entire hologram when a laser is used to produce an image. By this I mean if you take a piece of holographic film and cut out any portion of it, that portion, no...
  23. P

    How holographic technology will progress in the near future

    I have heard a lot about how holographic technology will progress in the near future, and have looked at how complex the equipment needed is. Will it be possible in the near future to have holographic projecters in the home, for example instead of TVs? How hard would it be to film and show a 3D...
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