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2answers
23 views

Holography with object and reference waves with a slightly different wavelength

Recently I've been looking into holography, where one interferes the object wave with a reference wave and encodes their combined intensity on a transparency, so that if one then re illuminates the ...
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1answer
38 views

Drawing in the air with lasers Question

Are there two different lasers that can be invisible when not overlapping, but visible when overlapping? I desire to build a hologram-ish thing, but with lasers. The system would use many lasers that ...
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0answers
35 views

3D hologram without a requirement of screen [closed]

How can I project a 3D hologram outdoor without a screen? is it possible to do it? Basically I just want a hologram of a square shape or a cube in a field at daylight.
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1answer
32 views

Hologram without requirement of screens

I'm not much familiar with holograms and I've read a few articles on how holograms are made. I have a question that how does hologram get projected in air? If it were tyndall effect, then we could see ...
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0answers
44 views

Proof that fixed points of a null field are zero

Suppose we have a scalar field $V$ (which can be acoustic pressure, or a scalar electric potential) that is a solution of the wave equation $$\Box V(x,y,z,t) = 0$$ I am wondering if a fixed ...
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1answer
42 views

How does a DIY holographic display work?

I made a holographic display with this tutorial, but now I'm wondering if the 4 projections on each side of the pyramid do interfere with each other. Can you get just the same image if you only ...
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0answers
23 views

Hologram Breakdown

Why does a hologram when divided still maintain the total image of the subject? And one would imagine at the atomic scale when the hologram is separated to such a small set of atoms the total image ...
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2answers
75 views

How is the virtual image reconstructed from a hologram?

To make a hologram a film is exposed to an incident plane wave and wave from the object to record the interference pattern on the film. The principle is commonly explained in a way like that in p.1212 ...
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0answers
77 views

About Fermilab's holographic experiment

I read this article. I am no professional, and certain statements left me wondering. They say: “We are specifically trying to determine if there is a limit to the precision with which we can ...
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1answer
30 views

Blazed phase profile to generate laguerre gaussian beam

How to add blazed grating to a fork grating to achieve maximum diffraction efficiency in the first order while generating laguerre gaussian beam?
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0answers
63 views

How does a hologram record the incident laser?

How does the hologram (the photographic plate) record the incident laser beams when they hit onto it, what happens inside the hologram so that it records these laser beams?
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3answers
152 views

Holograms other than light

Normal holograms are, if I understand correctly, what happens when coherent light is passed through something that manipulates the photon's wave functions to be what would have been present had they ...
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1answer
87 views

Do some people in 3D holograms doing the same things somewhere else in real life?

This question is about 3D holograms. I watched a few videos about holograms on youtube.On one of them there was a teacher who visits the class via hologram for a few minutes.I know that they made ...
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0answers
233 views

Possibility of a free-space hologram

Holograms are real. But they are not what sci-fi calls holograms. From a simple geometric optics standpoint we can see that in order to create the illusion of an object there must be some sort of ...
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0answers
38 views

How can an interference pattern encode both the angle of incidence and relative phase in a hologram?

For example - there are two "object" beams, both 180-degrees out of phase with the reference beam, which hit the recording plate at angles of incidence of 30-degrees and 90-degrees respectively. ...
2
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1answer
64 views

Is it possible for two holograms to be on the same holographic film?

I was thinking if you could use a laser of a specific frequency to write a hologram on a film, and then to try to record over the same film but with a laser of another frequency the the first. Is it ...
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0answers
19 views

Conjugated-Phase Matching

I am working on imaging applications of phase-conjugation in optics, in particular phase-conjugation imaging from recorded holograms. I have found several useful sources, but I cannot find a book ...
2
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1answer
199 views

How was the Michael Jackson hologram accomplished?

There have been a few presentations now in which a live stage performance was simulated by what was described as a hologram. The most recent example of this was the Michael Jackson "appearance". How ...
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1answer
222 views

Whether the holographic universe of string theory prove the hypothesis of the holographic universe created by David Bohm or not?

Bohm, David (1980), Wholeness and the Implicate Order, London: Routledge, ISBN 0-7100-0971-2 As we can see from the book above, David created the hypothesis of the holopraphic universe in 1980. And ...
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0answers
26 views

Help with Hologram problem [duplicate]

Can someone help me out with a simple yet interesting 3D hologram related problem and solution, which can help me understand the subject and then teach the subject to a group of students.
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3answers
409 views

How to understand holography and hologram

I've spent some time reading wiki etc. What I get now is that apart from the normal light amplitude information, holograms also record the phase information of light. But this is so difficult for me ...
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1answer
3k views

holographic projection in thin air? [duplicate]

from where I come from ,they taught us in high school that it is possible to project holograms in thin air simply by illuminating the hologram with the "correct light" , and having a semi transparent ...
1
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1answer
118 views

Holographic Image

In a holography set-up, as shown in the figure below, Illumination beam and reference beam both are in phase. The interference pattern generated at the detector contains the whole information about ...
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0answers
95 views

Why do I get different colours in scratched holograms?

I was making a scratched holograms and in result got different colours instead of white hologram
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0answers
38 views

Why do 3D holograms need curved lines?

I'm making a scratched hologram and I'm interested in we have to make curved lines to get a 3D image.
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1answer
110 views

Input parameters for the reconstruction algorithm in Digital Holography

I've been browsing some Digital Holography papers these days, and have come across this fundamental question. When you reconstruct the complex amplitude for the object image, you use e.g. Fresnel ...
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1answer
964 views

Physics of a hologram and its Fundamental Limitations

I understand the basic principle behind holography as the interference of a scattered wave with a reference beam which is captured using a photographic plate. The photographic plate is further used to ...
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0answers
238 views

3D holograms like Miku Hatsune? How do you make such things?

I am making a speech about Miku Hatsune 3D hologram, and I would like to know how they are made! I love Miku and Len...(drools) please help by explaining!
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1answer
232 views

Is a holographic recorder able to capture a large full color picture? [closed]

Is it practical to attempt to build a 3D hologram generator that is full color and big enough to recreate a watermelon full size? If so, is real-time control feasible?
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1answer
166 views

Holograms? Sci Fi or future fact?

Based on how light behaves when it passes through mediums, i.e. the wavelength of light changes when it passes through mediums of different refractive indexes, wouldn't it be possible to convert ...
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1answer
386 views

Computer-Generated Holograms: I'm completely lost. How are they physically implemented?

I have been reading about holography, and I think I understand the general concept, but one thing that has me completely lost is how computer generated holography works in practice. I think I get the ...
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0answers
141 views

How to convert a hologram into an image?

Suppose one knows in full detail the phase and intensity of monochromatic light in a plane. This is basically what a hologram records, at least for some section of a plane. By using this as the ...
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1answer
827 views

Can thick-film reflection holograms be used to create true mirrors?

Experimental alert: Someone may be able to answer this question experimentally simply by going to a shopping mall and finding the right piece of holographic jewelry. My question is whether the type ...
0
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2answers
1k views

Are holograms like in this video possible? [duplicate]

http://www.youtube.com/watch?feature=player_detailpage&v=jfySIeS1XZE#t=118s If so, how are they created (roughly speaking). Earlier in the video he says that a laser scanned the surface of the ...
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1answer
64 views

Does a “reflected” hologram produce a caustic in the shape of the original object?

Imagine you make a transmission hologram, ala the standard picture. Now you take your photographic plate, and everywhere it is transparent, you put a thin reflective layer on, and everywhere it is ...
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1answer
251 views

What is relation between Holographic principle and Hologram?

What is relation between Holographic principle and Hologram? The holographic principle is a property of quantum gravity and string theories which states that the description of a volume of space can ...
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1answer
1k views

How does a holographic object change perspective when the image is rotated?

Fundamentally i want to know: How do holograms work? The problem with that question is that normally you will end up with pages and pages talking about: a laser a beam splitter a diffuser the ...
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3answers
14k views

3d holograms - How are they created?

How do 3d holograms work exactly? I read that there is a laser in use, but how are the multiple perspectives generated and how is the light trapped? in a certain area to create the effect? ...
2
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1answer
2k views

How does holographic radar work?

I'm trying to figure out how the mechanics of holographic radar work. AFAIK there is a continuous 3d transmission signal (a dome-shaped antenna?) But because there isn't a direction or time-domain, ...
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1answer
149 views

Is it possible to create a hologram using X-Rays?

Is it possible to create a hologram using X-Rays (or other penetrating EM-waves)?
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5answers
7k views

Is it (theoretically) physically possible to project an image into thin air?

Is there some law of physics that strictly prohibits the projection of 2D or 3D images into thin air (such as holograms in movies) or is a solution to achieve this still up for grabs by an eventual ...
3
votes
1answer
147 views

How does holographic voxel density scale with holographic film metrics?

I'm trying to understand how one can generate bounds on the effective number of voxels (volumetric pixels) in a hologram, or information density, provided various metrics for the two-dimensional ...
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1answer
90 views

Creating the opposite of an optical lattice

Is it possible to create periodic potentials that instead of creating a well for an atom to be trapped in, repulsed by that specific location? If yes, can we use this as a means to make artificial ...