# Thread: How can holograms be 3-D?

1. I have a basic idea of how a hologram works, but what I don't understand is how a person can go around a hologram and see the backof the picture. For example, suppose a hologram is showing the bust of Abraham Lincoln, there would be no light that reflects off the back of that bust.

But yet a hologram can apparently show the back of that bust, and I don't understand why. If someone can enlighten me, I would appreciate it. Thanks.

2.

3. Originally Posted by LegalEagle
I have a basic idea of how a hologram works, but what I don't understand is how a person can go around a hologram and see the backof the picture. For example, suppose a hologram is showing the bust of Abraham Lincoln, there would be no light that reflects off the back of that bust.

But yet a hologram can apparently show the back of that bust, and I don't understand why. If someone can enlighten me, I would appreciate it. Thanks.
Are you asking how is a 3d halogram possible?
or
How can you make a halogram of a picture?

3d halograms are possible because it running a beam of light 'carved' to hit particles in a way that it reflects the light as the figure its producing.

Any halogram that you make of a picture can only be 100% correct by the front, because only there you can tell the light reflected from it. But computer programs can be used to generate a probable backside of the halogram

4. again Wiki to the rescue just look up 3D holagram
why waste time retyping stuff?

5. I wonder if you could use a mirror, or series of mirrors, and maybe a beam splitter to illuminate the back side of whatever you are trying to make a hologram out of. A bust of Einstein or Mozart or whatever.Tthen you some kind of dual layered film to produce a hologram that you can see the back side of.

6. Ah, so you need to film the object from different angles - that's what I was wondering.

OK, my question has been answered, so thanks, all of you.

By the way, how come we don't have hologram tv and movies? I'd think that we should be on our way there by now. If not, maybe there's a business opportunity for us.

7. Originally Posted by LegalEagle
I have a basic idea of how a hologram works, but what I don't understand is how a person can go around a hologram and see the backof the picture. For example, suppose a hologram is showing the bust of Abraham Lincoln, there would be no light that reflects off the back of that bust.

But yet a hologram can apparently show the back of that bust, and I don't understand why. If someone can enlighten me, I would appreciate it. Thanks.
I was not aware that anything like that existed. Where do you claim you've seen such a thing?

8. I don't know if they have full color holograms. You would need a full spectrum laser. I think they have accomplished this.

9. Originally Posted by salsaonline
Originally Posted by LegalEagle
I have a basic idea of how a hologram works, but what I don't understand is how a person can go around a hologram and see the backof the picture. For example, suppose a hologram is showing the bust of Abraham Lincoln, there would be no light that reflects off the back of that bust.

But yet a hologram can apparently show the back of that bust, and I don't understand why. If someone can enlighten me, I would appreciate it. Thanks.
I was not aware that anything like that existed. Where do you claim you've seen such a thing?
This has apparently been around for decades. Google, "holograms", and you can see various hologram studios all over the world. Or look them up on YouTube.

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