1 May 1996 Population inversion calculus from Faraday rotation in a He-Ne gaseous mixture
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We propose a method for the calculus of the population inversion between laser energy levels in a helium-neon gaseous mixture by measuring the resonance Faraday rotation. The possibility to study the population inversion versus different characteristic parameters of the electric discharge or of the gaseous mixture is offered. The results are useful for choosing the optimal conditions in realization of population inversion and enable study of the collisions between the atoms, ions, and electrons that are responsible for atomic excitation and de-excitation of different energy levels. In conclusion, the optimal conditions for the occurrence of the population inversion are coincident with those proposed empirically in literature (pHe/pNe=5 and the total pressure about 0.5 Torr).
Gabriela Cone, Ion M. Popescu, "Population inversion calculus from Faraday rotation in a He-Ne gaseous mixture," Optical Engineering 35(5), (1 May 1996). https://doi.org/10.1117/1.601029


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