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In ruby laser, the stimulated emission i...

In ruby laser, the stimulated emission is due to transition from

A

metastable state to any lower state

B

any higher state to lower state

C

metastable state to ground state

D

any higher state to ground state.

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The correct Answer is:
C
Ruby laser is a three level laser. In ruby laser, the stimulated emission is due to transition from metastable state to ground state.
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