Blain - you think so?
I'm not so sure.
Some of the brightest minds in the `states are making sure that the laser problems are all solveable.
100 - 150kw class is what they're targeting - and
HELLADS is roadmapped to be aircraft mounted - maximum onboard space ocuupiued to be no more than 2 cubic m.
In fact several elements of JSF design are oriented towards integration of a high powered laser - power is not an issue; you take it off the engine; cooling is in fact one of the biggest practical problems, and you use fuel as the heat sink.
Interestingly, one of the real challenges they face is dealing with the optical distortions introduced by airflow around the laser turret. Adaptive optics continue to progress at a great rate, driven by IMINT needs for spy satellites and high altitude airborne platforms.
Some
more detail here on when a laser might appear on the JSF.
Admittedly a 2007 paper, but even then the conclusion? A HEL laser could be fieldable by 2025.
R/e high G turns - all you have to do is exceed 9G, at which point the poor meat-pilot you're fighting succumbs to G-LOC...?
No doubt somewhere in the USAF or at Lockheed Martin a young accolyte of John Boyd is looking at drag polar charts for planned UCAVs and thinking about just these things.