The high average power infrared Free ElectronLaser (FEL) provides intense beams of laser light that can be tuned to atmosphere-penetrating wavelengths.
The US Navy's free-electron laser has broken a few records already, but it's just plowed through another fairly big one -- one that its creators say could put it on the fast track to actually being used to shoot down missiles.
While some of these weapon and sensor systems like the Electromagnetic Railgun or the Free ElectronLaser are at least a decade away, the Laser Weapon System and Air and Missile Defense Radar systems are almost ready for prime time deployment today.
Earlier this year a team at Lund University in Sweden used a laser with pulses measured in attoseconds (billion billionths of a second) to record an electron in motion.