GI Joe is way ahead of you there. Doc built these in his spare time while being a doctor and learning to drive a tractor trailer in his on base one man factory.
http://www.youtube.com/watch?v=zGx1Bqgkg08
In that clip, we see photon-capacitors (never heard of those before) used to collect laser energy, then we have laser beams arcing due to the gravitational effects of the Earth.
Science fail.