[Laser] NLOS Optical Comms

[Andrew T. Flowers, K0SM]

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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