I've been reading into directed energy weapons recently, and they seem like they're going to be a gamechanger. I'm just curious as to material countermeasures. I've learnt that some dielectric mirrors can be highly reflective, but I can't see them working in a protective fashion and I imagine the range of wavelengths they could reflect would be too small/specific. The current lasers built by Raytheon are between 10-50kW, the 10 kW one being able to shoot down a consumer drone in roughly 10 seconds.
Anyone with a material science/physics background chip in on how easy/what materials could be used as a countermeasure, and how effective you could imagine them to be? I'm just interested as to what the directed energy arms race might look like in 3-5 years. To what extent would simply painting weapons/drones white increase their survivability?