RELAXATION PROCESSES AND AMPLIFICATION OF RADIATION IN A DENSE PLASMA
Gordiets,B.F., Gudzenko,L.I., Shelepin,L.A.: 1969, Sov.Phys.JETP, 28, 489.
Some features of relaxation in a dense low-temperature highly ionized plasma
of a many-electron chemical element are discussed. It is shown that the
decisive role played by the collision transitions and the competition of
various relaxation channels cause (under certain conditions) a number a number
of levels of such a medium to acquire a population inversion that is
practically independent of either the probabilities for spontaneous radiative
transitions involving the frequencies in the infrared or visible spectra, or
of the reabsorption of the radiation. This is an important property of lasers
with a dense, highly ionized plasma (plasma lasers). The negative absorption
coefficient in such a medium is very large. Numerical calculations for the case
of recombining lithium plasmas illustrate the feasibility of the conditions
formulated in the paper.
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