General knowledge about laser here.
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"LASER" stands for "Light Amplification by Stimulated Emission of Radiation". Lasers amplify light by absorbing and radiating energy. The laser radiation is generated by a laser source. For this, concentrated energy is supplied to a crystal rod (solid state laser) or a special gas mixture (gas laser). This energy can be supplied in the form of light (flash lamps or diode laser) or by electric discharge (comparable to a fluorescent lamp). The crystal rod or the laser active gas is arranged between two mirrors. This generates a light resonator that directs the laser light into a specific direction and amplifies it in this manner. A defined percentage of the laser light is emitted through the partially transmissive mirrors and is available for working the material.