The Laser Tower is a defensive tower based on lasers. Its heated optical ray is great for wiping out masses of monsters, wave-by-wave (literally).
This tower has a high AoE damage and reload speed, effective against tanks or high HP monsters when surrounded with walls, but it can only attack one at a time. They can also wipe out a group of monsters faster than the Cannon Tower.
Before Feb. 12, they can kill maxed Chucks at lvl 3, making them useless against Lasers.