Laser cannon

A laser cannon was a large laser device used for industrial mining or as a directed energy cannon weapon aboard spacecraft and other installations or as ground artillery.

The Federation and many other cultures in the Alpha and Beta Quadrants seemed to have abandoned military use of laser technology in the mid-23rd century. Lysian Central Command, considered technologically to be a hundred years behind the Federation, was armed with four laser cannons as late as 2368. 

Starfleet's surface-deployable laser cannons that utilized energy transferred from a starship in orbit illustrate the late maturity of the technology. Showing a clear design lineage, late-model Starfleet cannons differed little in structure and scale from the industrial lasers used in mining operations as far back as 2155.