Discussion
In a He-Ne laser, the laser transition takes place in :
Answer: A
The laser transition takes place in Ne only.
In a He-Ne laser, the discharge excites helium atoms to metastable levels. Because these lie very close in energy to neon's 3s and 2s levels, collisions transfer the energy to neon, producing a population inversion in neon. The lasing transitions, such as 632.8 nm (3s to 2p), are all between neon levels.
Helium only pumps; it does not emit the laser light. So 'He only' and the two-stage options are wrong.
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