Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: Notesfiles $Revision: 1.6.2.17 $; site uiucdcsb.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!mhuxj!houxm!ihnp4!inuxc!pur-ee!uiucdcsb!chen
From: chen@uiucdcsb.UUCP
Newsgroups: net.physics
Subject: deflecting laser
Message-ID: <10800014@uiucdcsb.UUCP>
Date: Sat, 15-Dec-84 13:28:00 EST
Article-I.D.: uiucdcsb.10800014
Posted: Sat Dec 15 13:28:00 1984
Date-Received: Mon, 17-Dec-84 04:05:49 EST
Lines: 17
Nf-ID: #N:uiucdcsb:10800014:000:557
Nf-From: uiucdcsb!chen    Dec 15 12:28:00 1984


  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