The word LASER stands for “Light Amplication by the Stimulated Emission of Radiation“. In simple words, light particles (photons) excited by the current release energy in the form of light. This light is directed in a bundle. In this way the laser beam is formed.
Lasers are among the most important inventions of humanity and play a fundamental role in our daily lives; they are used in almost every area that we can imagine including electronics, modern medicine, defense and more.
All lasers are composed of 3 parts:
The pump source directs the external energy to the laser.
The active laser medium is positioned inside the laser. According to the design, the laser medium can be composed of a gas mix (CO2 laser), a crystal body (YAG laser) or fibreglass (fibre laser). When transferred to the laser medium through the pump, energy is emitted as radiation.
The active laser medium is positioned between two mirrors, the “resonator”. One of these mirrors is one-directional. Radiation of the active laser medium is amplified by the resonator.
At the same time, only certain radiation can leave the resonator through the one-directional mirror. This directed radiation is laser radiation.
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