Question

3.What is the need to achieve population
inversion?​

Answer 1

Answer:

Population inversion is a process of achieving more electrons in the higher energy state than the lower energy state. In order to achieve population inversion, we need to supply energy to the laser medium. The process of supplying energy to the laser medium is called pumping.

Explanation:

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Answer 2

Answer:

When a population inversion exists, an upper-state system will eventually give off a photon of the proper wavelength and drop to the ground state. ... This photon, however, can stimulate the production of other photons of exactly the same wavelength because of stimulated emission of radiation.

Explanation:

When a population inversion exists, an upper-state system will eventually give off a photon of the proper wavelength and drop to the ground state. ... This photon, however, can stimulate the production of other photons of exactly the same wavelength because of stimulated emission of radiation.