Question

derive an expression to show that the condition of population inversion is necessary for laser action.

Answer 1

not sure about this quest

Answer 2

Derive an expression to show that the condition of population inversion is necessary for laser action.

Answer:

If there is population inversion then it might save a day because thermal population will be distributed among many states.

The population distribution will take place in the current city than the existing city.

There are some ways to achieve the the population inverse than the three level atomic structure. The most important factor is that rate of atoms increase the upper level of of the current city than the existing city..