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From: gijs@vu44.UUCP
Newsgroups: net.physics
Subject: Re: deflecting laser
Message-ID: <531@vu44.UUCP>
Date: Tue, 18-Dec-84 20:16:39 EST
Article-I.D.: vu44.531
Posted: Tue Dec 18 20:16:39 1984
Date-Received: Sat, 22-Dec-84 01:18:38 EST
References: <10800014@uiucdcsb.UUCP>
Organization: VU Informatica, Amsterdam
Lines: 19


In <10800014@uiucdcsb.UUCP> Kaihu Chen writes:
> [] 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. []

They simply deflect the beam with a rotating or vibrating mirror.
The same technique is used in a laser printer: the light of a 
stationary laser is deflected in the x direction by a rotating
mirror and then projected on a rotating (light sensitive) drum.

		Gijs Mos
		Free University
		Dept. of Biology
		Amsterdam
		..{seismo,philabs,decvax}!mcvax!vu44!gijs