They are open to 'artificial star' attacks using lasers and the upper
atmosphere. They  are currently used in the Keck for example as 'adaptive
optics' so they can correct for distortions in the atmosphere. They use a
fixed amplitude beam and measure the variations, the opposite tack of
using a variable beam could induce non-randomness into the stream.

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                                           "Stranger Suns"
                                           George Zebrowski

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