Question

Explain what population inversion means for the lasing process? How is population inversion accomplished is obtained in the lasing process? Explain processes that can diminish the intensity of the laser radiation and how we can minimize these processes?

Answer 1

Population Inversion :

the no of atoms in the higher energy level (N₂) is greater than the no of atoms in the lower level(N₁) is known as Population Inversion.

that is N₂ > N₁

in the Lasing Process the process of population inversion plays a key role.

that is once population inversion occurs or achieved then the process of stimulated emission ( that is instead of once photon

it will give two photons ) is implies and due to this effect

the LASER light will comes out with

High Intensity

High Beightness

High Coherence

High Directional

If Population inversion process not fully accomplished then the intensity of the LASER light or LASER Radiation will be low.

so the Population inversion process is based on the no of atoms ( that means the active medium or chemical composition is

used ) in the lower level and pumping process.