A laser must be pumped to achieve:
A) a metastable state
B) fast response
C) stimulated emission
D) population inversion
E) the same wavelength for all photons

Question

Quizplus · Accepted Answer

Population inversion is a condition in which more atoms are in an excited state than in the ground state. This condition is necessary for stimulated emission, which is the process by which a laser produces light.

A Laser Must Be Pumped to Achieve