Generating Laser

The above left is a three-level laser energy diagram, where \(E_1 < E_2 < E_3\). Which of following explanations is NOT correct?

a) Level \(2\) is a metastable state.

b) Electrons stay longer at \(E_2\) than at \(E_3\).

c) There is no electron that shows a spontaneous transition from \(E_2\) to \(E_1\).

d) If a laser beam can be generated constantly, the electron population in level \(2\) must be larger than the electron population in level \(1.\)


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