Maser
A maser is a device that produces light and heat by using atoms to release energy. It was invented by Charles Hard Townes in the 1950s. A maser takes the small vibrations in atoms and amplifies them to release electromagnetic radiation. Originally, they were referred to by the acronym MASER or 'Microwave Amplification by Stimulated Emission of Radiation. Unlike most radio transmitters, maser waves tend to have very similar wavelengths. Their usage was first predicted by Albert Einstein. In the 1960s masers were made to emit optical wavelengths, and soon were called lasers.
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