Laser cannon

A Laser cannon was a type of energy weapon used by Starfleet in the 23rd century.

The USS Enterprise (NCC-1701) carried at least one portable Laser cannon which could be deployed on planets, using a microwave beam from the enterprise to power it.

In 2254 the Enterprise's Laser cannon was deployed on Talos IV when the crew attempted to rescue Captain Pike from Talosian captivity, whilst the Talosians generated an illusion that the cannon had done little damage it had in-fact sheered the top off of the targeted rock structure. (TOS episode: The Cage; EV comic: Nor Iron Bars a Cage)