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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