Phaser emitter

From Memory Alpha, the free Star Trek reference.

A phaser emitter is a key component in starship and hand-held phasers. The emitter is equivalent to the "barrel of a gun", as it is the focal point where the phaser beam (à la "the bullet") is fired from.

Ship-mounted

The ship-mounted emitters are usually arranged into phaser banks. The normal arrangement is one or two emitters to a bank. (Star Trek II: The Wrath of Khan)

According to the Star Trek: The Next Generation Technical Manual, Phaser arrays such as the dorsal saucer section array of a Galaxy-class starship consists of 200 emitter segments.

In 2372, the deflector of the USS Defiant was modified to perform as a single-shot phaser emitter when the ship was under attack from a Jem'Hadar attack ship in the atmosphere of a class J gas giant. (DS9: "Starship Down")

In 2375, Nog, acting as a representative of Miles O'Brien, bought a phaser emitter from the USS Musashi in a convoluted trade that also involved the USS Sentinel, to eventually acquire a graviton stabilizer. (DS9: "Treachery, Faith and the Great River")

Hand-weapons

Phaser emitters form part of the main component of hand phasers.

Phaser technology
Tools: phaser bore • phaser drill
Weapons: Bajoran phaser • compression phaser rifle • Galor-class phaser bank • hand phaser • Kzinti phaser • particle phaser • phaser array • phaser bank • phaser cannon • phaser emitter • phaser type-1 • phaser type-2 • phaser type-3 • phaser type-4 • phaser type-8 • Regalian phaser rifle • regenerative phaser
Other: phaser coil • phaser range • phaser relay • phaser room • phaser sweep