Observation of amplified spontaneous emission in the soft-x-ray region from a recombining lithiumlike aluminum plasma pumped by multipulse irradiation

摘要

An aluminum slab target was irradiated by 1.5 x 10(12) W/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 similar to 10 mrad for a 2.5 cm-long target. The experimental result was compared with a hydrodynamics simulation coupled with a collisional-radiative model. (C) 1997 Optical Society of America.