What Does LASER Stand for

Light Amplification by Stimulated Emission of Radiation

Laser stands for Light Amplification by Stimulated Emission of Radiation (Light amplification by stimulated emission of radiation). A laser is a device that emits electromagnetic radiation (light) with three fundamental features: Monochrome

– the light released have specific color, which means that its wave length is well-defined; Consistent – the beam of light is composed of photons that are in phase, i.e. are temporal and spatially aligned among themselves; Collimated light beam – is extremely narrow and focused, and the rays are nearly parallel to each other, what causes spreading very slowly along their propagation.

Due to its properties, the laser finds application in many areas. It is used in medicine (surgery, fighting pain and inflammation), in physical therapy, in aesthetic treatments (hair removal, tattoo removal), in industry (for cutting metals, measurement of distances), telecommunications (fiber optics), scientific research (atomic physics, quantum studies, optical tweezers) and also in our daily life (bar code reader, CD players, DVD and Blu-Ray).

Although the laser itself has not been created by Albert Einstein, the invention is credited to him because it was Einstein discovered stimulated emission, essential for obtaining physical effect of thermal equilibrium between radiation and matter, and therefore critical to the operation of the laser.

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