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Proceedings Paper

Optically ionized plasma recombination x-ray lasers
Author(s): Peter A. Amendt; David C. Eder; Scott C. Wilks; M. J. Dunning; Christopher J. Keane
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Paper Abstract

Design studies for recombination x-ray lasers based on plasmas ionized by high intensity, short pulse optical lasers are presented. Transient lasing on n=3 to n=2 transitions in Lithium-like Neon allows for moderately short wavelengths (less than or equal to 100 angstroms) without requiring ionizing intensities associated with relativistic electron quiver energies. The electron energy distribution following the ionizing pulse affects directly the predicted gains for this resonance transition. Efficiencies of 10-6 or greater are found for plasma temperatures in the Vicinity of 40 eV. Simulation studies of parametric heating phenomena relating to stimulated Raman and Compton scattering are presented. For electron densities less than about 2.5 x1020 cm-3 and peak driver intensity of 2x1017 W/cm2 at 0.25 μm with pulse length of 100 fsec, the amount of electron heating is found to be marginally significant. For Lithium-like Aluminum, the required relativistic ionizing intensity gives excessive electron heating and reduced efficiency, thereby rendering this scheme impractical for generating shorter wavelength lasing (less than or equal to 50 angstroms) in the transient case. Following the transient lasing phase, a slow hydrodynamic expansion into the surrounding cool plasma is accompanied by quasi-static gain on the n = 4 to n = 3 transition in Lithium-like Neon. Parametric heating effects on gain optimization in this regime are also discussed.

Paper Details

Date Published: 1 June 1991
PDF: 11 pages
Proc. SPIE 1413, Short-Pulse High-Intensity Lasers and Applications, (1 June 1991); doi: 10.1117/12.46136
Show Author Affiliations
Peter A. Amendt, Lawrence Livermore National Lab. (United States)
David C. Eder, Lawrence Livermore National Lab. (United States)
Scott C. Wilks, Lawrence Livermore National Lab. (United States)
M. J. Dunning, Lawrence Livermore National Lab. (United States)
Christopher J. Keane, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 1413:
Short-Pulse High-Intensity Lasers and Applications
Hector A. Baldis, Editor(s)

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