Why we need population inversion in laser... | Filo
Why we need population inversion in laser... | Filo
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Why is population inversion necessary in laser? - TimesMojo
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2. Population inversion versus pumping in an "upper-level" three-level laser system. It is possible (though not likely in practice) to have a three-level laser system which is pumped on the 1 → 3 transition and in which cw laser action takes place on the 3 → 2 rather then the 2 → 1 transition (no such real system is known). Suppose that level 3 in such a system is long-lived with lifetime τ3; level 2 has a short relaxation time to the ground state; and the system is pumped with transition probab
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