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{"ops":[{"insert":"7. In the Helium-Neon laser, lasing occurs between two excited states of the neon atom. How\u0002ever, in many lasers lasing occurs between the ground state and an excited state. Consider"},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"such a laser that emits at wavelength \u03bb = 550 nm. If a population inversion is not generated,"},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"(i) what is the ratio of the population of atoms in state Ex to the population in the ground"},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"state E0 with atoms at room temperature? For the condition in (i), at (ii) what temperature"},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"would the ratio Nx\/N0 be 1\/2?."},{"insert":"\n"}]}
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