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A maser is a device that produces coherent electromagnetic waves , through amplification by stimulated emission. The term is an acronym for microwave amplification by stimulated emission of radiation .
Maser variability is generally understood to mean the change in apparent brightness to the observer. Intensity variations can occur on timescales from days to years indicating limits on maser size and excitation scheme. However, masers change in various ways over various timescales.
The back-formed verb "to lase" is frequently used in the field, meaning "to give off coherent light," especially about the gain medium of a laser; [16] when a laser is operating, it is said to be "lasing". [17] The terms laser and maser are also used for naturally occurring coherent emissions, as in astrophysical maser and atom laser. [18] [19]
In the English language, an honorific is a form of address conveying esteem, courtesy or respect. These can be titles prefixing a person's name, e.g.: Mr, Mrs, Miss, Ms, Mx, Sir, Dame, Dr, Cllr, Lady, or Lord, or other titles or positions that can appear as a form of address without the person's name, as in Mr President, General, Captain, Father, Doctor, or Earl.
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The word maser derives from the acronym MASER, which stands for "Microwave Amplification by Stimulated Emission of Radiation". The maser is a predecessor to lasers, which operate at optical wavelengths, and is named by the replacement of "microwave" with "light".
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pseudo-blend = an abbreviation whose extra or omitted letters mean that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words). (a) = acronym, e.g.: SARS – (a) severe acute respiratory syndrome (i) = initialism, e.g.: CD – (i) compact disc