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Achieving population inversion in a two-level atomis not very practical. Such a task would require a very strong pumping transition that would send any decaying atom back into its excited state. This would be similar to reversing the flow of water in a water fall. It can be done, but is very energy costly and inefficient. In a sense, the pumping transition would have to work against the lasing transition.

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Related Questions

Can a two level system can be used for production of laser?

Yes, a two-level system can theoretically be used for laser production, but it is highly inefficient in practice. In a two-level system, the population inversion required for stimulated emission is difficult to achieve because any excitation of atoms or molecules to the upper energy level will quickly return to the ground state, leading to rapid thermalization rather than sustained lasing. Instead, most lasers utilize three-level or four-level systems, which facilitate a more effective population inversion and more efficient laser action.


Why 4 level laser system is better than 3 level laser system?

Three and Four Level Laser SchemesWe have said that the two level scheme is not generally feasible for laser action. There are two main reasons for this. The first reason is that the energy being used to pump the particles into the upper laser state has an equal probability of stimulating them back down. Thus it is not possible to get nore than half of the particles into the excited state. The three level scheme gets around this problem by first exciting the particles to an excited state higher in energy than the upper laser state.(See figure below) The particles then quickly decay down into the upper laser state. It is important for the pumped state to have a short lifetime for spontaneous emission compared to the upper laser state. The upper laser state should have as long a lifetime (for spontaneous emission) as possible, so that the particles live long enough to be stimulated and thus contribute to the gain.The four level laser scheme goes one step further and also depopulates the lower laser level by a fast decay process.(see figure below) This greatly decreases the loss of laser photons (v2) by stimulated absorption processes since the particles in the lower laser level have a short life-time for spontaneous emission.


What is a 3 level laser system?

A three-level laser system is a type of laser configuration that involves three energy levels: the ground state, an excited state, and a higher energy state. When an atom or molecule in the ground state is pumped to the higher energy state, it quickly relaxes to the excited state, where it can remain for a brief period before transitioning back to the ground state, emitting a photon in the process. This photon emission can stimulate further emissions, leading to laser action. The three-level system is commonly used in many laser types, including solid-state and gas lasers.


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