German Aerospace Center (DLR), Institute of Communications and Navigation in Oberpfaffenhofen
ARGOS / VABENE Coarse Pointing Assembly:

Very precise dynamic dual-axis autotracking of a laser beam for optical data transmission from an airplane to earth. Proven reliability demonstrated during various campaigns, including operation onboard a Dornier Do 228.

PDF: Optical Data Downlinks from Earth Observation Platforms
ARGOS and TOGS in Video