SIMPLE LASER COMMUNIC AT O R
TALK IN SECRET
OVER YOUR PRIVATE
LASER BEAM LIGHT LINK.
LIGHT CONVERSATION: No one will suspect
you’re communicating through a laser.
Photography by Garry McLeod
How would you like to talk over a laser beam? In about 15 minutes you can
set up your own laser communication system using a cheap laser pointer
and a few parts from RadioShack. The audio signal from a microphone varies
the power feeding the laser, so that its brightness changes, following the
shape of the original sound wave. At the receiving end, a solar cell or photoresistor converts the oscillating light signal back into the original sound.
The communication is completely private, with no wire connection to tap
into. Only you will be able hear what comes over the secret laser link.