No, lasers will not be a sufficient defense against ballistic missiles. Lasers require time to burn through the target. With ballistic missiles, they're facing a target traveling 5+ times the speed of sound (ie. little time), that also has heat shielding on the bit that's facing the target. Not to mention adverse weather conditions. And missiles w

Lasers will, however, be very effective at SHORAD, especially against cheap drones, rockets, artillery shells and cruise missiles, in the proper conditions. Iron Beam is projected to cost $0.50-$1.00 in electricity per shot, compared to a $50-60k Iron Dome interceptor missile (which is already insanely cheap for what it is).