Question

why population inversion is an essential condition for stimulated emission​

Answer 1

Answer:

Population inversion is the state in which the number of atoms in higher energy state is more than those in lower energy state. It is required in laser so that stimulated emission is more probable than induced absorption. ... of atoms are in lower energy states.

Answer 2

Answer:

Population inversion is the state in which the number of atoms in higher energy state is more than those in lower energy state. It is required in laser so that stimulated emission is more probable than induced absorption. ... of atoms are in lower energy states.

Explanation:

In stimulated emission, an electron that's in a higher energy state interacts with a photon that stimulates it to return to a lower energy state. When this occurs, a photon is released. ... Population inversion occurs when more electrons, in a particular situation, are in a higher energy state than in a lower energy state.