QUOTE (Tanegar @ Jul 12 2011, 06:07 PM)

That's... not really how lasers work. It's not a "spread" weapon. It produces a tightly collimated beam; the whole reason it even works as a weapon is that it produces a tightly collimated beam. Yes, you could mount a very powerful one on an aircraft, but it couldn't do anything that a Predator with a couple of Hellfires can't. Well, except that it doesn't have to worry about ammo.
Three Words: Adjustable Focusing Elements
My lawnmower can only cut a tiny patch of grass at any given moment. But somehow I manage to cut my rather large lawn. I dunno, it must be magic or something.
Compared to the engineering behind the laser itself, working up a focusing system so it can rapidly scan the beam back and forth across any given area should be trivial. If the beam can kill a man in 0.2 seconds, scanning back and forth in lines can quickly render the entire area being covered lethal to foot soldiers, quickly damage and degrade most vehicles, and cook off ammo stores. You could even adjust how closely the scan lines are together based on target types - trying to cook troops will probably need a much finer scan grid than trying to cook vehicles.
It would probably require a mini-nuke power plant to provide the energy needed for both the laser and the cooling system, and set the whole target area on fire, but hey.
I'll admit, though, even with such a system, they'd target small areas, not whole battlefields. But combined with cameras and other sensors to track movement, anyone caught out in the open in the target zone is likely to have a very bad day.
Then again, this is also true of ground troops getting targeted by an AC-130 already, so mebbe it's not such a new thing.
-k