Abstract

We report what is to our knowledge the first observation of a recombination pumped soft-x-ray laser with He-like ions. Amplification was observed for the 31D–21P transition of He-like N at 185.2 Å in a laser-produced boron nitride plasma. From time-resolved experiments, a small-signal gain between 3 and 4 cm−1 and a maximum gain–length product of 3.0 at 2.25 ns after the pump pulse were observed in a region of the plasma 200 μm from the target surface.

© 1995 Optical Society of America

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