Hi,
Several (many?) years ago National Geographic magazine show a picture taken
here in southern California of the state government sending red laser signals
between different mountain tops to keep track what was going on near fault
lines.
There were no technical details on what was taking place. So it can be done.
At a hamfest a few years ago I bought both a red and green 35 mW laser pen for
about $15 each. They do shine a long, long way. Whether these are powerful
enough, or can be properly modulated for what is needed, I have no idea.
On line I saw at least one China site that had much larger outputs available.
The prices were modest. FWIW.
Regards,
Perrier
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