olson@vixvax.mgi.com (Thor Olson) (12/18/90)
Does anyone know how computer generated holograms are done? I don't mean conventional holograms of computer generated images, but the actual computation of the interference pattern (of a computer modelled scene) recorded on the holographic plate. And once you have computed the pattern, how the heck is it recorded? The resolutions needed must be able to record wavelength size features, or is there some shortcut? This seems like an interesting topic. I'd appreciate any knowledge, references or even speculations. Thor Olson Management Graphics olson@mgi.com
ddulmage@cdp.UUCP (12/21/90)
>Does anyone know how computer generated holograms are done?
Well, I can't help you on the software, I would suggest you talk to
a company in our are (mpls) called APA optics. They do CGH's I
think that they even generate them on.... AUTOCAD! They just plot
out the interference pattern about a zillion times larger on to film
and reduce it from that. I don't have their number handy but they
are located in Blaine MN. (612). They could fill you in on the
details on their software.
Doug Dulmagewiml@milton.u.washington.edu (William Lewis) (12/30/90)
In article <1990Dec18.000028.566@vixvax.mgi.com> olson@vixvax.mgi.com (Thor Olson) writes: >Does anyone know how computer generated holograms are done? >actual computation of the interference pattern (of a computer modelled scene) >recorded on the holographic plate. And once you have computed the pattern, >how the heck is it recorded? The resolutions needed must be able to record >wavelength size features, or is there some shortcut? There was a "how to" article on this in the Apr-May 1990 issue of Circuit Cellar Ink ('issue 14'). The author managed to generate holograms by taking a picture of his VGA screen and photoreducing it, but it should be possible to photoreduce, say, laser printer output and get better results from having more dots ... Last time this topic came up (around Apr-May 1990) there was some source code posted to do the calculation. I didn't save any of it, however. -- wiml@milton.acs.washington.edu Seattle, Washington (William Lewis) | 47 41' 15" N 122 42' 58" W "These 2 cents will cost the net thousands upon thousands of dollars to send everywhere. Are you sure you want to do this?"
den@hpfcso.HP.COM (Don Novy) (01/03/91)
This topic was addressed several issues ago (Summer 1990) in a Circuit Cellar Ink magazine article. It detailed software that generated the hologram on a graphics raster. Taking a picture of the CRT and viewing the film with a laser allowed the hologram to be viewed. Don Novy don_novy@fc.hp.com