QUASI-STEADY POPULATION INVERSION OF He+ IN A FREELY EXPANDING PLASMA

Hara,T., Kodera,K., Ohgo,T., Hamagaki,M., Inutake,M., Dote,T.: 1982, Jpn.J.Appl.Phys., 21, L461.

Possibilities of a He II plasmadynamic recombination laser are experimentally investigated. It is confirmed by experimental results that large quasi-steady population inversions for i=3-4, i=3-5 and i=4-5 levels of He II exist over 5 cm downstream of the orifice. The maximum population inversion for the transition 4-5 observed corresponds to the single-pass gain of 1.03. A comparison is made between experimental data and calculated results on the basis of the collisional-radiative model on population inversion of He II levels.


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