Nuclear fusion might be a reality at ITER. It will be the first commercial scale reactor in operation (still with experimental purposes but with the aim of doing it commercially doable). But ITER will only be operational at 2018 (big machine, cutting edge technology, all new...) so we will be waiting a little to see how it comes out.
With this it's evident that if for us it is a near future reality, for ultra high tech aliens it most be a reality.
About the cold fusion, there are some theoretical problems that nobody could prove wrong (and there's not enough experimental data to prove wrong) that sustain the impossibility for chain reactions at cold fusion. Without a chain reaction fusion you can't produce energy, if this theoretical conclusion is in fact true then you can't produce energy by cold fusion, and this is valid here, mars, moon, other galaxies, etc (physics' laws are universal).
About the laser weapons, off course we can always believe that technology will involve in some way to miniaturize the size of machines (such as the apparatus used at that laser experience) but much of the times size is power and energy, and highly energetic lasers require high energetic apparatus.
I'm not ruling out the possibility of mobile laser technology, just point out the difficulties of such technology.