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The English abbreviation for laser is ( ).
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( ) was recommended to name “Amplification of Stimulated Radiation” as"激光".
In 1917, （ ）reinterpreted the theory of "the interaction between light and matter".
After the atoms absorb energy, they can achieve a transition from a low energy level to a high energy level.
Atoms fall back from a high energy level to a low energy. When they fall back, they release energy. This energy is emitted in the form of （ ）, and light is produced.
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