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Instead of emitting visible light, a maser generates a beam of pure microwave energy - electromagnetic waves intermediate in length between infrared and radar.
The complex maser rays and laser concentrate the incredible power of light into rays of various useful strengths: from rays so sensitive you can perform microscopic surgery with them, to brute rays that can pierce through a wall of steel.
Instead of emitting light, like a laser, the maser emits microwave energy at a specific frequency, which produces a very specific ticking.
Natural astronomical masers - the analog of laser emission at microwave wavelengths - are one class of coherent sources, but these emit in specific wavelengths.
There are of course lasers with wavelengths in the infrared, masers that emit coherent microwaves, and even x-ray lasers.
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