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Stimulated emission

process by which an incoming photon of a specific frequency can interact with an excited atomic electron (or other excited molecular state), causing it to drop to a lower energy level

Pronunciation
/ˈstɪmjʊleɪtɪd ɪˈmɪʃən/
/ˈstɪmjəˌleɪtəd əˈmɪʃən/