Well, at my knowledge, it's something that exist, even that i'm not a laser specialist, but one of my friend is actually a laser physician (because laser is part of optical physic) and he told me that if you laser have enough intensity, it can burn the light-sensitive cell of the satellite like it can burn the cell in your eyes. Maybe shooting a satellite at this distance seems to be hard, but don't forget that the speed of light is much more faster than the satellite can even move, but u still have to hit the good spot... So you have to aim in the optical part so the laser can blind effectively the satellite.