What is laser beam?

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The laser beam is produced when a photon, a particle of light, hits an atom that has excess energy. The photon stimulates the emission of an identical one which, in turn, collides with another atom and generates a new photon. As a result of this process, produces a stream of photons that make up the laser. All the light produced in this way has the same wavelength. The peculiarity of these rays is the concentration of energy in a very narrow beam. In the case of normal light, the energy is scattered in a vast space.

Laser light is red, but researchers are experimenting with a blue variety that would guide the flow of photons with greater precision.

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