Abstract

An aluminum slab target was irradiated by $1.5\times {10}^{12} \mathrm{W}/{\mathrm{cm}}^2$ glass-laser light. The irradiating laser light consisted of 16 pulses, each was 80 ps wide (FWHM), and the pulses were separated by 100 ps. Amplification of soft-x-ray light in the lithiumlike aluminum recombining plasma was observed, and gain–length products of 4.2 for the 15.4-nm line and 4.5 for the 10.5-nm line were obtained for a 3.0-cm-long target. The beam divergence was $\sim 10 \mathrm{mrad}$ for a 2.5 cm-long target. The experimental result was compared with a hydrodynamics simulation coupled with a collisional–radiative model.

© 1997 Optical Society of America

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