G Reim, Laser power, Aviation Week & Space Technology, 7-20 November 2022, p 49

In US, DARPA plans to be able to relay 10 kW of optical energy to an end point within 3 to 4 years. This system will start with a ground-based 50 kW laser from 124 miles away, and use 3 relay pods, each harvesting 1 kW of energy, permitting the host UAF to stay aloft indefinitely.