Conditions for gain in lithium-like aluminium

摘要

The optimal values of plasma temperature, density and ionic abundances for the production of population inversion in Al~(10+) are obtained from a C-R model, which is then coupled to a 1D- Lagrangian code to calculate the gain expected in laser-produced aluminium plasma columns. Comparison with two sets of experimental results are presented. The role of the duration and intensity of the driving laser pulse on the calculated gain is investigated. We show that a non-uniform illumination of the target along the focal line may cancel the net amplification of the X-UV beamlet in the plasma column.