"Hologram" has evolved in meaning over the past 40 years. To Gabor it meant a diffractive "whole picture" recorded by optical interference. Today its meaning very loosely includes much more: HOE's, any image with diffractive effects, and even practically any 3D image regardless of how it works. But the preferred meaning is "a pattern recorded via wave interference", with "wave" being light, sound, radio, or quantum mechanical particles.
Questions tagged [hologram]
98 questions
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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 recreate the original image by using it as a…
Prathyush
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The need of the reference beam in Holography
For a project, we're investigating how a transmission hologram works. I understand how the process of making this hologram works, but I can't get my head around just one thing. Why would a transmission hologram require a reference beam to illuminate…
P.Yntema
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How does a piston display work?
I was watching this video on how a Micromagnetic Piston Display works. After some research I can still not get my head around on how this display actually shows a holographic image. In my opinion, Francesco Pessolano in the video explains it like…
P.Yntema
- 181
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Information in Holograms
I was reading about Holograms, and I read something to the effect of the following statement -
"In a hologram, any part of the hologram with sufficient size contains the whole of the stored information"
What exactly is the mathematics behind this?…
ramseysdream111
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What happens when holograms get "too big"?
Since a hologram is a 3D object represented on a 2D surface...
3D objects scale like $L^3$ whereas 2D objects scales as $L^2$. Thus the information density scales as $L^3/L^2=L$.
This would mean (according to this logic) that the bigger the hologram…
user84158
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1 answer
Matter Holograms: What would be involved?
With photons, holograms are easy: shine laser light at a slit with an appropriate width, get a diffraction.
Shine laser light that is in-phase with the source light at the right spot downstream of the diffraction, at the correct angle... and place…
Chris
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What is the term for the simple, label/sticker like holograms?
From my everyday experience I can say that there are 2 types of holograms. One is the simple type that one can find on the important papers, paper money, as excise marks on the alcoholic beverages, as some simple security labels - they are those…
TomR
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How much can we infer internal structure from a hologram?
How much can we infer internal structure eg of an arbitrary object, like a sphere or cell, from a holographic interference pattern on its surface?
velniukas
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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 all of the path through which light goes but not…
Quark
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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 would no longer be present in that section. What is…
StarDrop9
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Are plasma holograms really 3D
After reading this article and watching the video attached in it, I wondered if a plasma hologram is really as three dimensional as they say. I would say the hologram is only three dimensional if you can walk around it, and see the image from…
P.Yntema
- 181
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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 holograms of even dead people like Michael Jackson.…
Mrt
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