Lasers
SciShow Tangents
What Is a Laser?
Laser is an acronym and it wasn't the original acronym in 1955. The first device that used stimulated admission of radiation was microwave amplification by stimulated emission of radiation, also known as a maser. There's a hot debate about who first came up with the word laser. Some people use masers to say microwave or lower; anything higher frequency than microwave is a laser.
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