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.


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