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Article #8840Re: Sources for high-brightness red LEDs
From: John Nagle
Date: Fri, 07 Dec 1990 19:18
Date: Fri, 07 Dec 1990 19:18
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What's the output wavelength on these things, and how stable is it?
Is it narrow and stable enough that you can use an interference filter
to block other light sources at a detector?
On interference filters: the passband changes with the off-axis
angle, according to the literature with one such filter. Is the
relationship w2 = w1 / (cos a) where w1 is the on-axis wavelength,
a is the off-axis angle, and w2 is the off-axis pass wavelength?
That would require very careful alignment. Or is it something less
severe, and if so, what's the mechanism?
John Nagle
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Path: arc1-ca.pugleaf.net!utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!samsung!zaphod.mps.ohio-state.edu!usc!apple!well!nagle From: nagle@well.sf.ca.us (John Nagle) Newsgroups: sci.electronics Subject: Re: Sources for high-brightness red LEDs Message-ID: <22022@well.sf.ca.us> Date: 7 Dec 90 19:18:18 GMT References: <10926@rama.UUCP> <3340009@hpcvca.CV.HP.COM> Lines: 13