: Astronomie: maser

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maser

A maser is a source of very intense, narrow-band, coherent microwave radiation. 'Maser' stands for 'microwave amplification by stimulated emission of radiation.' Masers (and their optical counterpart, lasers) involve the interaction between an electromagnetic wave of a certain wavelength and an atom or a molecule in a suitable (excited) energetic state. The passage of the wave triggers the atom/molecule to give up energy in the form of more radiation of exactly the same wavelength. This reinforces the passing wave, which can then interact with more excited atoms to build up a well-directed, intense pulse of monochromatic (single-wavelength) radiation. (Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/M/maser.html)

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