Article View: sci.electronics
Article #20881Re: Correct Terminology
From: Colin Plumb
Date: Sat, 25 Feb 1989 01:47
Date: Sat, 25 Feb 1989 01:47
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sukenick@ccnysci.UUCP (SYG) wrote: > Collimated: the output is directional, and there is no such thing as perfectly > collimated... (Dr. Heisenberg wouldn't let you get them perfectly > straight and even if you did your best, the photons'll feud > amongst themselves and spread out) Um.. don't I remember someone cracked this problem? Instead of a (statistical) normal distribution of intensity as you get away from the axis, someone used a Bessel function or something. Less than 10% efficiency, but then you can send it literally forever. If the light from the laser has a cross-sectional intensity distribution D, and 1m further out it has diffused to f(D), they solved f(X) = X. Doing it along the axis of beam propagation produces solitons - very useful for transatlantic fibres! -- -Colin (uunet!microsoft!w-colinp) "Don't listen to me. I never do."
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!microsoft!w-colinp From: w-colinp@microsoft.UUCP (Colin Plumb) Newsgroups: sci.electronics Subject: Re: Correct Terminology Message-ID: <743@microsoft.UUCP> Date: 25 Feb 89 01:47:47 GMT References: <603@icus.islp.ny.us> <7944@netnews.upenn.edu> <5632@homxc.ATT.COM> <55@enuxha.eas.asu.edu> <1310@ccnysci.UUCP> Reply-To: w-colinp@microsoft.uucp (Colin Plumb) Organization: very little Lines: 20