gas laser

A gas laser is a type of laser that uses a gas as its active medium to produce a beam of light. In these lasers, a gas mixture, often containing helium and neon, is contained within a tube. Energy is supplied to the gas, typically through an electric current, which excites the gas atoms. These excited atoms then release energy in the form of photons, creating the laser beam. Common examples include the helium-neon laser, which emits red light, and more powerful carbon-dioxide lasers used in industrial applications. Gas lasers require an optical resonator, formed by mirrors, to amplify the light and create a focused beam.12