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Lasers have many uses, laser pointers, cd/dvd/blu-ray players and writers, Optical tweezers, Laser cooling, Communications, just to name a few.

The list of weapons that start with laser are:

Laser axe

Laser bow

Laser chaingun

Laser chainsaw

Laser cannon

Laser crossbow

Laser daggers

Laser gatling gun

Laser knife

Laser machete

Laser machine gun

Laser rapier

Laser rocket launcher

Laser scythe

Laser shotgun

Laser slingshot

Laser sword

Laser tommy gun

Laser whip

and countless others

Tunable lasers are commonly used for recording transmission data, or absorption information. In some applications, cooling is required, and tunable lasers are good for that use as well.