GATE PH 2021 PH Q15: Atomic and Molecular Physics

To sustain lasing action in a three-level laser as shown in the figure, necessary condition(s) is(are)

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lifetime of the energy level 1 should be greater than that of energy level 2

population of the particles in level 1 should be greater than that of level 0

lifetime of the energy level 2 should be greater than that of energy level 0

population of the particles in level 2 should be greater than that of level 1

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