Laser (an abbreviation of the English language: Light Amplification by stimulated Emission of Radiation) is a mechanism for a device that emits electromagnetic radiation, usually in the form of light that can not be seen nor can see with normal eye, through the process of stimulated emission. Usually a single laser beam, emits photons in a coherent beam. Lasers can also be said to the effects of quantum mechanics.
In laser technology, demonstrate a coherent light source that emits wavelengths of light are identified from the same frequency, the phase difference is constant [1] and polarization. Furthermore, to produce a coherent light from the lasing medium is to control the purity, size, and shape. Continuous output of a laser with a constant-amplitude (known as CW or continuous wave), or rate, is to use the techniques of Q-switching, modelocking, or gain-switching.
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