NUMERICAL STUDY OF OVERPOPULATION DENSITY FOR LASER OSCILLATION IN
RECOMBINING HYDROGEN PLASMAS
Oda,T., Furukane,U.: 1983, J.Quant.Spectros.Radiat.Transfer, 29, 553.
Overpopulation densities Pij, which are defined as the differences
between the population densities per unit statistical weight of the upper
and lower excited levels i and j, are calculated as a function of the electron
density ne for various electron temperatures Te in recombining hydrogen
plasmas. Calculation have been made for line pairs with principle quantum
numbers (2,3), (3,4) and (4,5). The effect of the ground level population
density n1 on Pij is calculated. In this calculation, the atom-atom
collision and the self-absorption of the resonance lines are taken into
account. The n1-dependence of Pij remains almost constant until the
self-absorption becomes significant. The threshold condition for laser
oscillation is discussed in relation to the calculated Pij. Laser oscillation
is possible for the line pair (2,3) at an electron density and temperature
higher than for the other pairs (3,4) and (4,5) when self-absorption is
negligible.
An numbered index of references
or a sequential list of abstracts
is also available.