The phaser is the standard Federation beam weapon system. This type of weapon came into common use c.2255, replacing the laser weapons then in service. Phaser is an acronym for PHASed Energy Rectification, a term which referred to the original process by which stored or supplied energy was converted to another form for release toward the target without any need for an intermediate energy transformation. Although this term is something of a holdover, it remains true in modern phaser systems. Phaser energy is released by the rapid nadion effect. Rapid nadions are short lived subatomic particles which can liberate and transfer strong nuclear forces within a class of crystals called fushigi-no-umi.Phasers have three distinct effects on the target. At low power settings - setting 1 to 3 on a hand phaser - the impact of phaser energy is almost wholly limited to simple electromagnetic and mild thermal effects. These are concentrated on the nervous system of the target, causing pain and/or unconsciousness in most beings. At higher levels the thermal effect becomes prevalent, and the phaser will begin to cause physical damage to the target resulting in moderate or severe injuries. By the time the power level is at setting 7 the energy is distributed equally between thermal and nuclear disruption energy. Disruption effects become widespread, resulting in immediate death to most Humanoid life forms.At levels higher than 7 the majority of phaser energy is in the form of nuclear disruption. A large portion of the target is simultaneously vaporized and transitioned out of the continuum, a process which is instantly fatal. The higher power settings available with Type 3 phasers (setting 9+) cause severe damage over a wide area. These settings are rarely used because of the relatively high power consumption; a single setting 10 discharge uses more than twenty five times as much energy as a setting 7 discharge, while a setting 16 discharge uses over three hundred and fifteen times as much.Starfleet has used many models of phaser over the years, but all fall into distinct Types. Each of which represents a general classification of the energy the weapon is capable of releasing. The type of a phaser apparently does NOT refer to or limit its rate of fire or other factors.Most smaller phaser weapons are deployed in single emitters, also known as a 'phaser bank'. Larger and more modern weapons group many emitters into linear arrays. These use force coupling to allow the energy of one emitter to be transferred almost instantly to another - a process which can be repeated along arrays of almost limitless size. This confers many major advantages : it allows a large group of emitters to discharge their combined energy from any single emitter in the array. This allows longer sustained beams to be fired, and greatly reduces the recharge and cooling time since the energy is spread over many emitters. In addition, redundant feeds to small groups of emitters within the array increase the systems resistance to battle damage since destroying part of the array will not disable the remaining emitters. A long array can also bring the whole firepower of every emitter to bear within one single beam - a vessel equipped with many separate phaser banks must combine separate beams to accomplish this, something which the firing arcs of the weapons may not allow.

These are the types of phasers most widly used: