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You can't really have an invisible laser that does more than blind people. Laser stands for Light Amplification by Stimulated Emission of Radiation, which mean to be powerful enough to burn someone almost instantly, it needs to be visible.
FYI, Fallen Mage: Real world visible-light lasers generally are invisible. The light travels all in one direction so unless the laser beam actually strikes your eye, you will not be able to see it.
Laser beams are only visible to those outside the path of the beam when they strike particles enroute to their target. For example, dust, smoke, or mist in the path of the beam causes some of the light in the beam to scatter in various directions, causing the beam to become visible. Without such interference, laser beams are quite invisible.