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Why do we not have 2-level lasers?

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Population inversion is a necessary step in the workings of a standard model. In science this phenomenon of population inversion occurs when a system exists in a state in which more members of the system are in higher excited states than in lower unexcited energy states. read more

Lasers are the coherent beam of light with a particular f requency.So a particular level of laser beam reflects to its particular frequency. Then no two levels of laser have existence simultaneously. read more

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