Re: Laser communications idea

James Rogers (
Sun, 10 May 1998 14:07:08 -0700

At 01:43 PM 5/10/98 -0700, you wrote:
>If the communicator scatters diffusively (as compared to reflecting the
>light directly from point A to point B, which would require very careful
>aiming), then you have two inverse square transmissions multiplying each
>other, for an inverse fourth power efficiency. That would require much
>more power than just getting the laser from ground to space or back.

Hmmm...I was talking about diffusive scattering. The idea was to use
piggyback the signal on other people's satellites.

However, wouldn't a telescopic lense on the detector be sufficient to
concentrate the signal on the detector, even at low power? I suppose this
might not work during the day though, unless you used a wavelength with
good contrast, and possibly not even then.

-James Rogers