[LASER] P3D Laser experiment]

Mon, 14 Jan 2002 00:09:05 -0600

Hi
1.2 E12 square meters is approximately  1000 km x 1000 km ...or a 600 mile
.square.  At 22000 miles up or 36000 km up, that means roughly a 1.7 degree
beamwidth.  With a typical Fresnel lens about 12"x12", we capture the energy
incident on 0.1 sq meter ... for a path loss of only 130 dB.  With 1 watt
out optical, we would capture about -100 dBm of light. .... not very much,
but maybe ...?

The light source on AO-40 had better be aimed very well and would probably
be unreceivable 500 miles away from the target.

Did I estimate correctly?
John Matz KB9II

----- Original Message -----
From: "David Riley" <[email protected]>
To: <[email protected]>
Sent: Sunday, January 13, 2002 10:24 AM
Subject: Re: Re: [LASER] P3D Laser experiment]

> " Area illuminated on earth 1.2 E+12 square meters "
>
> What would be the approx. square miles for this footprint?
>
> 1.2 x a million times a million must be mighty wide, no??
>
> ----- Original Message -----
> From: "Joseph B. Fitzgerald" <[email protected]>
>
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