I imagine a large part of anything like this would be adaptive optics, needing to deform the mirror so the wave front on passing through the atmosphere can resolve to a tight enough focus on the target.

So just like making Astronomy pictures sharper, but the other way around.

Alas this is about the only chance I get to use my laser postgrad knowledge.

There was a thought to use lasers to power a moon base, when the dark side of The Moon is facing Earth, possible, a handy excuse I’d guess for building an energy weapon.