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Essay text:
It stands for "light amplification by
stimulated emission of radiation". They produce a narrow, intense beam of
coherent light.
In a laser the atoms or molecules of a crystal, like ruby or garnet-or
of a gas, liquid, or other substance-are excited so that more of them are at
higher energy levels than are at lower energy levels. If a photon whose
frequency corresponds to the energy difference between the excited and ground
states strikes an excited atom, the atom is stimulated, as it falls back to a
lower energy state, to emit a second photon of the same frequency, in phase
with and in the same direction as the bombarding photon...
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