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