[Laser] NLOS Optical Comms

[news]

http://www.llnl.gov/str/Guidestr.html

----- Original Message -----
From: "Andrew T. Flowers, K0SM" <aflowers at frontiernet.net>
To: "Free Space LASER Communications" <laser at mailman.qth.net>
Sent: Friday, November 19, 2004 5:38 PM
Subject: Re: [Laser] NLOS Optical Comms


> Another question:  How far high in the atmosphere were the returns?
>
> Andy
>
> KY1K wrote:
>
> >
> >>  an experiment
> >> to study upper atmosphere air flow at the University of Illinois.  We
> >> used
> >> a rhodamine 6G dye laser, which excited the "D" lines of sodium in the
> >> upper atmosphere.  A telescope with a Fresnel lens about 1000 feet away
> >> used a photomultiplier tube to detect the returned light from the
> >> sodium.
> >
> >
> > Please tell us more-
> >
> > How much power output did the laser have? What wavelength gave good
> > returns? Is this mode only usable with backscatter, or is it possible
> > it might support some other reflection angles and be usable over a
> > 'real' comm range?
> >
> > What size lens did you use to collect light? If your receiver was
> > co-located, did you have QRM problems or did you have to listen for
> > the beat frequency (doppler frequency)?
> >
> > Please tell us more-
> >
> > Thanks,
> >
> > Art
> >
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> >
> >
>
>
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