Questions tagged [hologram]
"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.
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Is there a way of changing air refractivity?
Is there any kind of way/equipment that can change the air refractive index? For example, a mirage is hot air refracting light in a certain way, making it look like water.
The best I could think of ...
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3D holographic image reconstruction in optics
I am trying to understand how 3D reconstruction of holographic images work. I have a basic knowledge of the holography principle in optics, and that there are several methods for phase retrieval and ...
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Where is the focus point on a picture with full parallax?
Let's assume I have a theoretical display that can show a different flat picture depending on the viewer's location. It would provide different images to the left and right eyes of a human observer. A ...
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3D hologram point from lasers [closed]
Firstly, I'm not a physics guy. I want to try to create a 3D hologram point with lasers. As I know, if I have at least 3 lasers in the same wavelength and their beam is crossing each other at a single ...
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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 (...
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Can a hologram be programmed to emit a specific frequency of EM radiation?
Do holograms emit EM radiation, or is it possible to program a hologram to emit specific frequencies of EM? If possible, would it require light shining on the hologram to emit the EM?
I am asking this ...
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Is there a type of hologram that could be used to focus light?
I was wondering if a hologram could be made that could focus light that wasn't in the original hologram. I'm assuming that this would have to be a mathematically constructed hologram as, by my ...
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What is the maximum virtual depth achievable in a printed hologram?
I remember a few years ago printed holograms were quite fashionable. Even though they still had different colors from reality, I found them quite impressing.
I wonder if there has been any progress in ...
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Holograms as a superposition of many individual interference patterns
I've recently started reading about non-linear optics and holograms. While I do understand the basics of how holograms are made, by superposing the reference waveform on the object waveform over a ...
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Kirchhoff Diffraction for backwards wave propagation
Classic Kirchhoff Diffraction integral for a monochromatic wave is formulated with a restriction that it's only applicable to a point that's outside of the volume enclosed by the integration surface ...
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Metasurface holography as a principle behind volumetric displays?
Disclaimer: By no means am I a physicist of any kind so complete inability to grasp complex physical concepts without spending ridiculously unreasonable amounts of time on corresponding research is a ...
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Hologram: At the "crux" of the hologram, is there any potential for wave-wave interaction?
Starting with Gabor's original 1948 paper:
https://www.nature.com/articles/Art56
And continuing where that paper left off with Gabor's Nobel Prize paper,
https://www.nobelprize.org/uploads/2018/06/...
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Electrons and Positrons: What happens when a positron beam in-phase with diffracted electrons is used to make a hologram with the anti-electrons?
Suppose two independent beams of positrons and electrons are filtered such that each is in phase with the other (correction: this probably isn't possible, although terminology to this effect is out ...
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Is the Standing Wave of a particle Hologram "interactive"?
In other words, suppose one creates a particle hologram -- no photo reaction, just a standing waveform in space. Suppose the particle is something we are skilled at manipulating, like an electron.
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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 ...
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