Re: Earth's Magnitude

From: Thomas Fly (
Date: Mon Jun 30 2003 - 07:22:58 EDT

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    It's worthwhile to point out what makes a laser a laser- coherent, monochromatic light.  Even if the laser light were invisible to a
    human looking at the earth through a telescope, a bit of filtering would easily improve the signal-to-noise ratio enough to make it
    visible.  Also, frequency modulation of the laser beam (that is, the laser pulses would be precisely timed) is another means of
    pulling the signal out of the background noise.
    Since you're concerned with communication between 2 satellites, atmospheric distortion isn't a factor, and you'd only have to
    guarantee sufficient pointing accuracy of the lasers.  My guess is that a laser diode from a CD player would have all the output
    power you'd need.
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