Laser Core System
The Laser Core System used by most space going powers has been developed independently by several military contractors in the mid 21st century, as they attempted to protect the vulnerable lasers previously used against counter laser fire. This aim of the developers was reached by removing the laser itself from the mounting point of the main aperture and move it beneath the armor.
The single lasers of the old distributed laser apertures could then be combined into a single laser core, where the beam could be split and fired from any or several of the space craft's laser apertures. In case of couter laser fire, the laser directors for a laser aperture can be completely closed and the laser path be blocked by a layer of armor, cooled down by the main cooling system of the spacecraft.
Currently only larger combat spacecraft employ the Laser Core System as it is bulky.