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What is a Laser

What is a Laser

laserLASER: Light Amplification by Stimulated Emission of Radiation.

The formal definition: A device that converts some form of energy (electrical, optical, chemical, etc.) into a narrow beam of light which is monochromatic (single pure color) and coherent (all waves in step with one another).

Monochromatic means that it consists of one single color or wavelength. Even though some lasers can generator more than one wavelength, the light is extreme "pure" and consists of a very narrow spectral range.

Directional means that the beam is very well collimated and travels over long distances with very little spread in diameter.

Coherent means that all individual waves of light are moving precisely together through time and space, or are in phase. The effect of one wave enhances the strength of every other wave, so that the overall effect of coherent light is much greater than if the waves were not in phase.

Because of these properties laser light can be focused to an extremely small spot, which results in a very large power density which produces a very high temperature.

laser

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