Holographyforum.org / holowiki.org

That dust motes cause scattering is of course true, but wouldn't at least a little light be transmitted through the dust particles, and continue down the length of the beam? If that were so, the light would be going through a less dense medium (air) to a more dense medium (dust). In that case, the ...

Oh, I see what you mean. You're implying that if the diffraction pattern of a dust mote is stationary on the plate, it should be possible to make a hologram of that pattern, as if you're making a hologram of a porcelain cat. Then, you reconstruct the hologram to see a floating dust mote in mid-air. ...

If what you say is true Dinesh, then wouldn't it be possible to record a hologram of particles floating in a beam? Disregarding the Doppler effects? Like these: http://www.sciencedirect.com/science/article/pii/S0030401810007522 https://www.osapublishing.org/ao/abstract.cfm?uri=ao-6-3-519 http://www...

I agree that particles in the air scatter the light in a beam, but the diffraction patterns caused by that scatter that propagate along with the beam do not cause any visible effect on a surface the beam hits. Bob, why not. So long as the particulates are moving relatively slowly, the diffraction p...

The beam appears to "clean itself" because the area of the beam is expanding. Also, the Gaussian profile is also expanding over the field of view. The "dirt" in a beam on a surface is due to scattering from surfaces and particulate matter in the air. In a vaccuum, with clean inte...

I am so sorry about this.

The money issues make this story even sadder. Maybe we can all sell something (to each other) and send the money to the family? That is a good use for the For Sale section here right? I am in....Phil Yes. I'd like to be in too. But all I have is old dcg's on coasters and clocks. I'm a little busy n...

I think I'd spend like 500 USD for a well made hologram in that style, but for sure not 3000. If there are any other interesting full color motives then I'd at least be listening. I could do it for $500 if you can wait. I'm a bit busy now, but I could probably fit it in about 2 - 3 weeks.I don't do...

Arturo, All three words are colloquialisms, they pretty much mean the same thing. Which way you flip/rotate/spin the plate depends on the ref direction. To "copy" an image is to make a hologram of a hologram. In order to do this, the wavefront from the first hologram must form the "ob...

Colin, We thought about it. But, as Arturo points out, the mechanical and thermal stability is a problem. However, when I heard that the resolution of some of these printers, using photopolymers, can get down to 16 microns, that peaked my interest. At 16 microns, a HeNe beam will deviate about 2 deg...