Physics trivia

The laser beam

A laser beam is a type of electromagnetic radiation visible to the human eye. Laser is a word that is formed from the words light amplification by stimulated emission of radiation, which together mean “amplification of light by emission stimulated by radiation”. The laser has special characteristics such as, for example, it is monochromatic, coherent and collimated, in addition to having a wide technological and scientific application that has been expanding more and more every day.

In addition to being monochromatic, ie, consisting of radiation of a single frequency, laser light is very powerful due to the large concentration of energy in small areas (small beams). The laser beam is very powerful and can be brighter than the light emitted by a lamp.

Physicist Albert Einstein, in 1916, laid the foundations for the creation of the laser based on Max Plank’s theories. However, these bases were forgotten during the Second World War. It was in 1953, thirty-seven years later, that scientists managed to produce the first laser, or rather, a device very similar to a laser, as it did not have the ability to continuously omit waves. Although he was not the creator of the laser, A. Einstein is credited with being the scientist who discovered the physical effect behind the operation of the laser, the stimulated emission, which is the necessary condition for having thermal equilibrium of radiation with matter.

Due to its characteristics, the laser is widely applied today, for example, in medical surgeries, in scientific research, in holography, in CD and DVD players, as well as in the laser pointer used for slideshows. In industry, the carbon dioxide laser has been widely used, as it enables a fast process of cutting and welding materials. The applications of leisure ray are numerous and have become more and more diversified, in a way that it is impossible to relate them all.

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