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From: mcdonald@aries.scs.uiuc.edu (Doug McDonald)
Newsgroups: comp.graphics
Subject: Re: Hologram.
Keywords: COMPUTER GENERATED HOLOGRAM
Message-ID: <1990May5.144845.26503@ux1.cso.uiuc.edu>
Date: 5 May 90 14:48:45 GMT
References: <511@lily.warwick.ac.uk> <11165@bsu-cs.bsu.edu>
Sender: usenet@ux1.cso.uiuc.edu (News)
Reply-To: mcdonald@aries.scs.uiuc.edu (Doug McDonald)
Organization: School of Chemical Sciences, Univ. of Illinois at Urbana-Champaign
Lines: 36

In article <11165@bsu-cs.bsu.edu> cfchiesa@bsu-cs.bsu.edu (Christopher Chiesa) writes:
>In article <511@lily.warwick.ac.uk>, laucy@warwick.ac.uk (TS Wong) writes:
>> Is there anyone have experience of direct computer generate hologram?
>> The idea is to use a computer to generate the interference pattern
>> and then use photographic technique to resize the interference
>> pattern.
>
>No DIRECT experience, but I did THINK of this same idea a while back and
>ask the folks I work with about it.  My company, Light Valve Technology,
>makes a Digital Image Recorder capable of laying down continuous-tone
>exposures at up to 1016 lines/inch, and I wondered if this was sufficient
>to create holograms.  Apparently, though, one would need much higher reso-
>lution to do this with our type of equipment.  
>
>On the other hand, perhaps with other (most likely laser) output tech-
>nology you should be able to do it.  I would think the calculations for
>determining the interference patterns would be the only hard part, IF 
>you have equipment capable of laying down the results onto film.  Do 
>you have an output device in mind?
>
>> 
>> Any relevant materials about this topic will be wellcome.
>> Thanx.
>
>I'd like to hear more about this, too, so that I can try it myself.  I've
>got access to lots of technology including our Image Recorder AND a bunch
>of old laser equipment!
>
At 1000 lines per inch you could indeed generate a hologram. But
it would be like looking through a pipe an inch in diameter and
a foot long. You need at least 15000 lines per inch, preferably 50000,
for a nice wide window.



Doug McDonald