Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 25, Issue 7, Pages B32-B38Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.25.000B32
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We report the study of warm plasmas created by soft-x-ray laser irradiation of solid targets in which single-photon photoionization is the dominant energy absorption mechanism. Low-absorption (silicon, Z=14) and high-absorption (chromium, Z=24, and silver, Z=47) targets were heated by similar to 1 ns duration pulses from a 46.9 nm wavelength soft-x-ray laser. The spectra obtained agree with 1 1/2-dimension simulations in showing that the Si plasmas are significantly colder and less ionized, confirming that in contrast to plasmas created by optical lasers the plasma properties are largely determined by the absorption coefficient of the target material. (C) 2008 Optical Society of America.
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