Laser/Legends

Laser weapons operate in a similar fashion as blasters, but are much more powerful. They are usually mounted on starfighters, freighters, and other small spaceships; larger warships instead use turbolasers, which provide even more destructive power, but require bulky generators and other equipment. Laser cannons are sometimes mounted in turreted pairs, while ships such as Trade Federation Lucrehulk-class battelships and the Millennium Falcon are equippped with quad laser cannon turrets. Quad laser cannon mountings consist of a regular laser cannon that is sent through a splitter to turn it into four beams, each funneled through its own cannon barrel.

Behind the scenes
Laser is an acronym for Light Amplification by Stimulated Emission of Radiation, though lasers as seen in Star Wars bear few similarities to those in real life (i.e. using plasma as part of the beam's composition), and so it is doubtful if “lasers” in Star Wars share the same principles of generation or fundamental nature as true lasers.