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From: ross@dsd.UUCP (Evan Ross)
Newsgroups: net.physics
Subject: Re: deflecting laser
Message-ID: <376@dsd.UUCP>
Date: Fri, 11-Jan-85 13:59:40 EST
Article-I.D.: dsd.376
Posted: Fri Jan 11 13:59:40 1985
Date-Received: Mon, 14-Jan-85 03:48:42 EST
References: <10800014@uiucdcsb.UUCP> <113@anasazi.UUCP>
Organization: AMPEX DSD, Redwood City, CA.
Lines: 5

One common means for single dimensional raster-scanning with a laser is
to reflect it off the outside surface of a mirrored rotating polygon.  The
rotation causes the angle of intersection (an reflection) of the beam 
to constantly change. This can be applied to two polygons (of different
speeds) to produce a two dimensional scan.