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Laser

Light Amplification by Stimulated Emission of Radiation (Laser) is a device that will emit electromagnetic radiation in the form of visible light by the process of stimulated emission. The light that is emitted by the laser device is monochromatic, which means it has a specific wavelength. Laser light is also coherent because the photons are launched in a uniform wave front. It also has low divergence and the beam is extremely concentrated.

Laser light is produced by pumping the atoms of the lasing medium with electrical discharges or light flashes. The electrons in the atom will gain energy, become excited and move one or two energy levels higher. However, these electrons will not remain at an excited state for long and they will return to their original state by releasing a photon (ie: light energy). The amount of energy emitted by the excited electrons when they return to a relaxed state, will determine the wavelength of the light.