population inversion

By pumping energy into the system we can achieve a population inversion.

Making something into a laser requires the creation of what's called a population inversion.

However, this pumping does not produce a population inversion as in conventional lasers.

Since there is no population inversion, we cannot use a laser to drive population back to the ground state.

However, after a point, the population inversion cannot be maintained any longer and the maser becomes saturated.

Direct measurements established that there was no population inversion between the relevant excited and ground states.

This is referred to as a population inversion.

The population inversion in the laser is achieved by the following sequence:

To achieve population inversion therefore requires pushing the system into a non-equilibrated state.

A population inversion therefore builds up in the 6S upper laser level.

This makes them suitable for use in lasers as it makes the population inversion easy to achieve.

In other words, a population inversion () can never exist for a system at thermal equilibrium.

This increases the degree of population inversion.

Therefore if (i.e. ) then and a population inversion will exist.

The separated population represents a population inversion which can exhibit stimulated emissions.

They also proposed a method for the production of population inversion using inhomogeneous electric and magnetic fields.

Since a good quantity of molecules remain in the upper state, a population inversion is created, which often extends for quite a distance downstream.

This drastically reduces the population of the lower energy state thus greatly facilitating a population inversion.

The population inversion is actually maintained in the "dopant", such as chromium or neodymium.

When a population inversion () is present, therefore, optical amplification of incident radiation will take place.

This produces a population inversion, but laser operation cannot yet occur since there is no feedback from the resonator.

The simple existence of a pumped population inversion is not sufficient for the observation of a maser.

Finally, lasers are an example of a system at infinite temperature; you have a population inversion in a finite-level system.

To understand the concept of a population inversion, it is necessary to understand some thermodynamics and the way that light interacts with matter.

Then the light wave can run through the cavity, depopulating the excited laser medium at maximum population inversion.