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Article #15946Re: lasers/collimated light i
From: right here, right now
Date: Sun, 03 Jan 1993 02:30
Date: Sun, 03 Jan 1993 02:30
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In article <1992Dec31.072835.7253@netcom.com> nagle@netcom.com (John Nagle) writes: >"glen mead" <glen.mead@canrem.com> writes: >>jlange@radian.uucp (John Lange) writes: >>JL>In nightclubs I have recently seen light effects which apparently >>JL>use bright red, green, and blue lasers which are modulated with >>JL>mirrors (I think) to do interesting things like project color >>JL>images on a wall. The red could be a simple He-Ne laser, but what >>JL>about the green and the blue? > > I suspect you are seeing a xenon lamp fronted by a color wheel and >mirror galvonometers, all computer controlled. These are now a common >disco lighting gadget. The beam is collimated well enough that it looks >like a laser beam, but it isn't. Look for leakage of white light from >the unit. > > John Nagle The device you describe is called an "Emulator". They're nice. and they were basically produced when many of the states passed Laser Laws , banned high-power lasers. -- John
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Newsgroups: sci.electronics Path: arc1-ca.pugleaf.net!sparky!uunet!spool.mu.edu!yale.edu!yale!mintaka.lcs.mit.edu!silver.lcs.mit.edu!jna From: jna@silver.lcs.mit.edu (right here, right now) Subject: Re: lasers/collimated light i Message-ID: <1993Jan3.023057.20134@mintaka.lcs.mit.edu> Sender: news@mintaka.lcs.mit.edu Organization: We Take What We Want, Inc. References: <1992Dec29.4265.27305@dosgate> <1992Dec31.072835.7253@netcom.com> Distribution: sci Date: Sun, 3 Jan 1993 02:30:57 GMT Lines: 24