A three-level system of atoms has N, atoms in level E₁, N₂ in level E, and N₂ in level E3(N₂>N₁² and E₁

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A three-level system of atoms has N₁ atoms in level E₁, N₂ in level E₂ and N in level E₂(N₂>N>N3
and E₁<E₂<E₂). Laser emission is possible for the transitions:
(c) E₂ → E3
(a) E, → E₁
(b) E3 → E₂
(d) E₂ → E₁
Transcribed Image Text:A three-level system of atoms has N₁ atoms in level E₁, N₂ in level E₂ and N in level E₂(N₂>N>N3 and E₁<E₂<E₂). Laser emission is possible for the transitions: (c) E₂ → E3 (a) E, → E₁ (b) E3 → E₂ (d) E₂ → E₁
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