Abstract

We report saturated operation of an 18.9-nm laser at 5-Hz repetition rate. An amplification with a gain–length product GL of 15.5 is obtained in the $4d {{}^{1}S}_0–4p {{}^{1}P}_1$ laser line of Ni-like Mo in plasmas heated at grazing incidence with $\sim 1‐\mathrm{J}$ pulses of 8.1-ps duration from a tabletop laser system. Lasing is obtained over a broad range of time delays and pumping conditions. We also measure a GL of 13.5 in the 22.6-nm transition of the same ion. The results are of interest for numerous applications requiring high-repetition-rate lasers at wavelengths below 20 nm.

© 2005 Optical Society of America

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