Perhaps as a weapon in space, it might be feasible, where there is nothing to get in the way between the laser's production and the laser's target. But in a no

Perhaps as a weapon in space, it might be feasible, where there is nothing to get in the way between the laser's production and the laser's target. But in a normal atmosphere there will be a 'defocusing of the beam' caused by heat blooming. That effect will be even worse in a moist atmosphere.