LASER ACTION IN NON-LTE ATMOSPHERES

Menzel,D.H.: 1970, in 'Spectrum Formation in Stars with Steady-State Extended Atmospheres', eds. Groth,H.G, Wellmann,P., NBS special publication 332, p.134.

The radiative transfer equation is written in microscopic form, and from some simplifications on the ratio of occupation numbers for upper and lower level, a laser action is suggested.

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