"The US Army hopes, within a few years, to deploy a plasma shield - a machine that generates a protective screen of dazzling mid-air explosions - to stun and disorient an enemy."
http://www.newscientisttech.com/article/dn11723-plasma-shield-may-stun-and-disorientate-enemies.html I always thought a "stun" setting for a laser was wishful thinking, but this actually looks feasible. I wonder how you make sure the plasma ball starts in the vicinity of the enemy, and not right at the muzzle of your laser rifle?