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A laser is a piece of equipment that emits light through a method of optical amplification formulated on the stimulated emanation of electromagnetic radiation. In 1917, Albert Einstein formulated the theoretical groundwork for the laser. It was based on Planck’s law of radiation and conceptually built on probability coefficients for assimilation, impulsive emission, and stimulated emission of radiation. In the year 1928, Rudolf W. Ladenburg validated the existence of stimulated emission phenomena and negative absorption. Valentin A. Fabrikant predicted that stimulated emission could be used to amplify short waves in 1939. The first laser was constructed by Theodore H. Maiman (1960). It was developed based on the works of Arthur Leonard Schawlow and Charles Hard Townes.