Abstract
A scheme to achieve stationary continuous-wave (cw) lasing in the vacuum- and extreme-ultraviolet spectral region is proposed. It is based on recombination pumping in a freely expanding plasma produced in a high pressure, high temperature plasma jet. Stationary cw-lasing at 1640 Å or 729 Å can be expected by inverting the He II (2←3) or Li III (2←3) Balmer-α transition following three-body recombination of bare He2+ or Li3+ ions, respectively. The expected gain coefficients are calculated using a time dependent collisional-radiative model and estimates of the required pumping power as well as considerations on the technical feasibility of the concept are presented.
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