Send Music over a Laser Beam
Here is yet another thing to do with those promotional laser pointers: send music (or data) from point A to point B over the laser beam using amplitude modulation. All it takes is pointing the moded laser at a detector, and music can be heard from an attached amplifier. The range and quality (or data speed) can vary, but I have gotten a HALF MILE of range with excellent audio quality and around 300bps of throughput.The image shown here is the transmitter and reciever working across my desk during a test.
Much inspiration for this project came from http://sci-toys.com/scitoys/scitoys/light/light.html#laser_communicator
By: navaburo Source: type: instructable [date]
