Emissions from certain resonance lines which are considered to be promising source candidates for matched-line photoexcitation pumping of plasma x-ray lasers have been measured and are found to be near the saturation level. This is supportive of current numerical modeling and laser experiments. The radiation is emitted from high density plasmas near the surface of laser-heated slab targets of selected materials. Among numerous possible ion combinations to be surveyed, a very promising test case involves Na9+ ions pumping Ne8+ ions for lasing at 23, 7.8 or 5.8 nm wavelengths. Spectra from frozen neon targets which include the Ne6+-Ne8+ ions will be presented.
Soft x-ray lasing has been achieved for the first time on 3p-3s transitions in neon-like copper (Cu19+) and germanium (Gezz+). The elongated lasant plasma was produced using the NRL Pharos 111 laser operating at X = 1.05 pm, 300-480 J with a pulse duration of 2 ns. Lasing was observed in the wavelength interval 196 to 286 A for J = 2 -1 and J = 0 -1 lines, using both thin film and thick slab targets.
Soft x-ray gain coefficients of 1.7-4.1 cm-I are .measured on eight lines in the wavelength range of 196 to 286 A using 3p-3s transitions in neon-like Culgt and GezZtions. The lasant plasma is created by a high-power laser line-focused onto thin-foil and solid-slab targets. Measured wavelengths agree with calculations. A previously-reported anomaly in gain for a J=O upper level is small in these experiments.
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