A Fusion Thruster for Space Travel – Clean, highly energetic reaction delivers a lot of drive from a drop of fuel “[...] improvements in short-pulse laser systems could make this form of thruster more than 40 times as efficient as even the best of today’s ionic propulsion systems that push spacecraft around. The specific power of the proton-triggered boron fuel would be so great that a mere mole of it (11 grams) would yield roughly 300 megawatts of power. [...]” http://spectrum.ieee.org/aerospace/space-flight/a-fusion-thruster-for-space-travel/0