Maser

Rarity: Rare

A topic known well beyond its field, found in many languages.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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Notion

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What Wikipedia says

A maser is a device that produces coherent electromagnetic waves (microwaves) through amplification by stimulated emission. The term is an acronym for microwave amplification by stimulated emission of radiation.

Excerpt from the Wikipedia article “Maser”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Dan Rubin, Public domain, via Wikimedia Commons.