| Author | Message | ||
     Larry Elie Rating: N/A |
OK, I have noticed (along with everyone else) how Microsoft and others are stamping nice Holographic images on the CD's they sell. Sure, they have the big-bucks to do it. Then I start thinking; I used to do Holography some 25+ years ago on spectroscopic plates, and although I don't do that sort of thing anymore (I still do Physics, but not physical optics), I remember reading how one can compute where the necessary particle locations were to make the required interference patterns, and in the 70's that was mainframe sorts of calculations. I put a few things together and realized that since I can burn the die on a CD with NERO or Adaptec on the right size order to do interference, that if one understood well the burn pattern, one should be able to burn 'data' on a CD that would be literally a holographic image. The math isn't trivial, and I'm not going to run right out and try it, but I'm wondering if anyone has. Any links? Larry Elie | ||
| Eric Lindstrom Rating: N/A |
interesting idea! it might work. but you realize the burner could only do like 2 color values, since the laser only pits the media, y'know binary, 1's and 0's, black and white, no greyscale. the lasers aren't precice enough for hi-res holograms, and the image would be grainy. still, it might work for experimental purposes. -Eric L. | ||
| Larry Elie Rating: N/A |
Eric, that isn't the way interference effects work. Reflective holograms and Lippman color pictures don't work by the colors of the dyes; they work by creating standing waves or interference fringes based on the dimensions of the pattern, in this case the depth of the pits in the die and the spacing between them. If the spacing is on the order of the frequency of the light involved, you get a pattern. If you can choose the pattern, you can choose the picture. This is what I did over 25 years ago using Kodak B&W 649 Spectroscopic 4x5" plates; I got all the colors of the lasers I had, and for Lippman Color pictures, all the colors of the white light I had available. The problem here is that the CD burning program writes basically sequential data, and there are a number of correction algorithms that 'fix' any non-sequential data sets, then fixes the whole thing in a fat at the end. Actually, if one were clever, one could probably write an image, marking the bits as 'bad' and then still write some data with the fat only referencing the real data. In other words, you could have a picture and some data on the disc. Yes, I have made a few contacts; there are people trying to 'compute' holograms based on CAD pictures for example, and am looking at whether I want to work hard enough to try this. But it still looks real interesting. Larry Elie | ||
| Alexander Oest Rating: N/A |
Hi Larry Did you get any further with the hologram-burning? If so, please let's have an update. Alex |
