Laser

A laser (an acronym of light amplification by stimulated emission of radiation) is a device that emits a focused beam of light by concentrating and orienting the direction of that light in a precise direction. Though invented in the 20th century, in recent years Humanity has expanded the technology to various portable UNSC applications.
Laser could refer to any of the following:
*Spartan Laser - The UNSC's only known handheld Directed-Energy-Weapon.
*Pulse Laser Turret - The weapons mounted on the Covenant warships and ONI Prowlers.