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Maser
MASER

Definition: Any of a class of amplifiers and oscillators that convert the internal energy of a molecular or atomic system into microwave energy by the interaction of electromagnetic radiation with the system. In this way waves with precisely determined frequencies may be obtained. A maser operating at optical frequencies is known as a laser or optical maser.
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See perfect amplifier.

See perfect form (1).
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See perfect device (1).
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See perfect type (1).

See perfect oscillator.

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