Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/5/84; site anasazi.UUCP Path: utzoo!watmath!clyde!burl!ulysses!allegra!bellcore!decvax!genrad!teddy!panda!talcott!harvard!seismo!hao!noao!terak!anasazi!will From: will@anasazi.UUCP (Will Fuller) Newsgroups: net.physics Subject: Re: deflecting laser Message-ID: <113@anasazi.UUCP> Date: Mon, 7-Jan-85 13:33:54 EST Article-I.D.: anasazi.113 Posted: Mon Jan 7 13:33:54 1985 Date-Received: Fri, 11-Jan-85 06:35:38 EST References: <10800014@uiucdcsb.UUCP> Organization: Anasazi, Phoenix Az. Lines: 29 > > I remember seeing the world map projected onto the silver dome > in monochrome laser in the EPCOT center, Florida. How did they do that? > They must have a way of deflecting the laser light to make it > does raster scanning. I can imagine only two ways to do this: > > 1) move the laser device mechanically. > 2) projects laser through some tansparent medium whose refractivity > is electronically controllable. > > The second one seems to be a more reasonable solution to me. Anyone > knowledgeable in the field care to comment on this? > > > Kaihu Chen > uiucdcs!chen The map might be projected holographically. Perhaps a raster scan might be achieved using either the Kerr electro-optical, or the Voigt & Cotton-Mouton magneto-optical effects. The beam intensity could be modulated via a Pockel Cell. Every time I have seen someone scan something with a laser they've used some variant of a mirror on an air bearing, and a linear servo (yawn). William Fuller ..!terrak!anasazi!will