CubeSats Communicate with Lasers
Jet Propulsion Laboratory https://www.jpl.nasa.gov/ April 9, 2019
A brief laser flash at the center of the frame was part of an experiment conducted by two NASA CubeSats. In it, one small satellite used a laser to send information to the ISARA CubeSat, managed by JPL.
For more information about CubeSat see www.jpl.nasa.gov/cubesat/.