Population inversion induced by collisions in a two level system under nonresonance optical excitation

Population inversion induced by collisions in a two level system under nonresonance optical excitation

When the gas particles, which can be considered as a two level quantum system, are affected by frequent collisions with buffer gas particles (thermal reservoir), the spectral densities of the Einstein coefficients for absorption and induced emission are unequal to each other far from the absorption...

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Veröffentlicht in:Physical review letters 2002-05, Vol.88 (21), p.213601-213601, Article 213601
Hauptverfasser: Markov, R V, Plekhanov, A I, Shalagin, A M
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creator Markov, R V
Plekhanov, A I
Shalagin, A M
description When the gas particles, which can be considered as a two level quantum system, are affected by frequent collisions with buffer gas particles (thermal reservoir), the spectral densities of the Einstein coefficients for absorption and induced emission are unequal to each other far from the absorption (emission) line. The relationship between the spectral densities at the specified condition reveals new physical phenomena. The mostly convincing example is the fact that population inversion is established in a two level system under nonresonance optical excitation. This effect is experimentally observed as a lasing on sodium resonance transitions.
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title Population inversion induced by collisions in a two level system under nonresonance optical excitation
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