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Laser weaonry may not be that far away from tomorrow's battlefields.  (Source: Wired, Danger Room)
The U.S. will possibly field man-sized portable laser weapons in coming years

One of the cornerstones of science fiction films and books is the laser rifle. The U.S. has spent millions of dollars trying to field laser weapons to do all sorts of tasks and, according to some analysts, we are getting close to fielding man portable laser weapons.

Time Magazine tells the story about developments in laser weaponry, circa 1972. Many of us are familiar with the laser weapons that are being designed to stop ballistic missiles before the warhead can separate from the missile body. These tend to be very large lasers that are mounted on trucks or inside specially outfitted aircraft.

One type of laser weapon that has yet to materialize is the man-sized portable laser. The lasers were described as being able to burn a quarter-inch hole in an enemy solider from as far away as five miles.  And, unlike Star Wars, real world lasers leave no visible trail.

The weapon would be a snipers dream since the laser beam would travel at the speed of light; once the target was in the sights, a hit was ensured. Another benefit of portable laser weapons is the fact that a laser beam follows a flat trajectory rather than a curving arc like a projectile. Gravity has practically no effect on a laser beam, so lining up a shot at extreme distances is much easier to do with a laser rifle than with a projectile weapon.

These laser weapons have yet to materialize and with the drawbacks of chemical laser technology, namely the storage of corrosive chemicals and harmful fumes resulting from the laser operation, who knows when or if man portable laser weapons will be perfected.

Chemical lasers get energy from a rapid chemical reaction and obtain continuous wave with power at the megawatt level. Common types of chemical lasers used in drilling and military applications include chemical oxygen iodine laser, all gas-phase iodine laser, and deuterium fluoride laser.  Almost all laser-based weapons to date have been chemical based.

Yet there are still some laser weapon technologies that could bring the long dreamed of laser gun to fruition. Solid-state lasers, the oldest and most mature types of lasers, are one of the more viable options since they don’t require corrosive chemicals to produce the laser beam. The solid-state laser simply requires a supply of electricity to produce a beam, and only needs enough power for a single pulse rather than a continuous beam.

Current solid-state lasers are used for everything from tattoo removal to optical refrigeration. However, unlike gas and chemical lasers, solid-state lasers cannot achieve megawatt capabilities without vast amounts of electricity -- not practical for mobile forces.  Yet kilowatt lasers may be enough for soldiers on the ground. 

From Boeing's $7 million High Energy Laser Technology Demonstrator, to Northrop Grumman's $57 million Joint High Power Solid State Laser, 100kW portable solid-state lasers can now fit the size of a truck.

According to Wired we cold see solid-state pulse lasers fielded by U.S. soldiers in as little as two years. Of course, according to the Time's 1972 article on laser technology, man-sized portable laser weapons would have been viable for a decade now.

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RE: Secret Service
By Hawkido on 8/29/2007 2:50:42 PM , Rating: 2
Masher2, Your a good person to ask this as your accuracy is in the high 80's (%).

My understanding of the Wave-Particle Duality of light seems to demonstrate that while light acts both as a wave and as a particle it can also act independantly as only a wave or only a particle as well. As such, can you interrupt light using a property of only one (wave or particle) and therefore absorb or dissipate the entire laser (in this case). I know wave cancelation works on sound, and I have heard theories that it will also work on light, but it should be easy to demonstrate. Now, either I need to read a more-up-to-date book or they haven't secessfully completed this. Does this mean it isn't possible to defeat light by only opposing one of it's dual properties? Never mind you would need to modulate your wave to the plar opposite frequency of the incomming laser, and be of sufficient energy that by the time it reachs the target, it has lost the potent edge from the beam.

The point about EM field as a defense should work (disregarding power-source needed) as a great deal of the Sun's energy is deflected by the Earth's EM field. However, as strong as the Earth's EM field is, a great deal of light energy still gets through, and it takes miles of our EM barrier to deflect the Sun's energy (which would be on the same level as the energy needed per CM^2 to be an effective weapon). I think the intense EM field needed to defeat a portable Weapon class laser, would be far more harmful to the person it was trying to protect than the laser threatening them.

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