Resonant photo-pumping x-ray-laser scheme using intense characteristic x rays for water-window radiation generation.

A line pair for a resonant photo-pumping x-ray-laser scheme is proposed in which the wavelength matching between the aluminum Kα⊂2 line (λ = 0.833 95 nm) and the 2p6-(2p1/2,4d3/2)1 transition of the neonlike zinc ions (λ = 0.834 00 nm) is used. The population kinetics code of the neonlike zinc ions in plasma under irradiation of the aluminum K α line shows that substantial amplification gain can be generated in the transition of (2p1/2,3p1/2)0-(2p1/2,4d3/2)1 at a wavelength of 3.5 nm. We also investigate the experimental arrangement of this scheme, which implies that this scheme is feasible with the present ultra-short-pulse-laser technology. [ABSTRACT FROM AUTHOR]