There are 3d radar systems where nothing moves, instead the signal is shaped and directed using precisely timed small signals sent from an array of separately c

There are 3d radar systems where nothing moves, instead the signal is shaped and directed using precisely timed small signals sent from an array of separately controllable antennas. Maybe light can also be done like that? I mean - obviously you could just create a stationary disc with lasers mounted all around it and switch between them electronically, but that hardly seems cheaper.