This criticism is usually brought up with this kind of energy transfer (solar beamed down from orbit etc.). But would it not be rather simple to build in some k

This criticism is usually brought up with this kind of energy transfer (solar beamed down from orbit etc.). But would it not be rather simple to build in some kind of feedback mechanism, where the ground station beams back at the orbital unit as long as it is receiving an incoming beam? It would act as a switch, where, as soon as the incoming beam stops, the feedback stops and the orbital transmitter would stop too, e.g. if the energy beam went out of position.