Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!rutgers!sri-spam!sri-unix!hplabs!tektronix!tekgen!tekred!billr From: billr@tekred.UUCP (Bill Randle) Newsgroups: sci.electronics Subject: Re: laser communications Message-ID: <820@tekred.UUCP> Date: Wed, 29-Oct-86 16:39:10 EST Article-I.D.: tekred.820 Posted: Wed Oct 29 16:39:10 1986 Date-Received: Thu, 30-Oct-86 23:20:11 EST References: <2200@orca.TEK.COM> <557@hp-sdd.HP.COM> Reply-To: billr@tekred.UUCP (Bill Randle) Distribution: na Organization: Tektronix, Inc., Beaverton, OR. Lines: 13 Keywords: laser Actually, you can do some modulation without using a variable opaqueness device in front of the beam. There was an article in Popular Electronics about 16 years ago on how to build a modulator-demodulator for a HeNe laser. I built one up for the laser our high school had, but never did get it to work right. As I recall, it used a "fire-fet" (vacumn tube) to do the modulation, but I don't remember much else. You could probably find the back issue in a library (try the Reader's Guide circa 1969 - 1970) and update it using transistors/ICs. -- -Bill Randle Tektronix, Inc. !tektronix!tekgen!tekred!billr