What i could see is the effects of millions of pulses of at least 10 watt lasers, which will burn a retina instantly, like the ultimate gatling gun. While a single beam could be deadly i think if you can build an array that has thousands of movable emitters you can counter drone swarms.
Drone swarms is the hot selling ticket right now. Orchestrated drones that can split up to avoid even a close in weapon chain gun.