OT: Upper limit on Lasers, range and power....

[NullAshton]

You could bounce a laser off a mirror in space. Maybe use multiple beams, that are focused at the time the laser bounces off the satellite. But I believe there's a treaty banning any sort of space weapons.

As for the shooting down ICBMs or multiple warheads with a laser, I don't think it's that hard. You don't even need a very powerful laser, you just need to vaporize the trigger and no more detonation.

Large lasers are hard to make, because I believe there's a limit on just how much energy you can channel because of inefficiencies. The powerful laser beam goes though the laser, and the laser melts. So much for blowing something up with that laser.