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21 October 1986 Techniques And Initial Results From An X-Ray Laser Experiment Using Laser-Vaporized Copper Foil Plasmas
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Proceedings Volume 0664, High Intensity Laser Processes; (1986) https://doi.org/10.1117/12.938717
Event: 1986 Quebec Symposium, 1986, Quebec City, Canada
Abstract
A series of exploratory experiments recently carried out at NRL were directed towards the possible utilization of laser-heated ultra-thin copper films for generating elongated plasmas of sufficient uniformity to produce amplification on 3s-3p transitions in neon-like copper ions. The NRL Pharos III laser operating at 140-335 J in 2-6 ns pulses was used as a driver. Variations were made in the plasma length, the laser energy and pulse shape, and the copper thickness in order to optimize the gain-medium conditions. A primary necessity was to assure on each attempt an accurately-aligned vuv grazing-incidence spectrograph. Using space-resolved x-ray crystal spectroscopy and pinhole photography as auxiliary diagnostics, axial homogeneity as well as front/rear symmetry were measured. The electron temperature in the Cu XX plasma, as estimated from intensity ratios of 2p-nd transition x-ray lines, was found to increase with copper thickness. Various explanations for the lack of measureable gain in these inital tests are discussed. A novel slotted copper foil (thicker) target design was also tested and showed similar characteristics to the thin copper film targets. Also, spectral features from a selenium target exposure are described.
© (1986) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
W A Molander, T N Lee, J L Ford, and R C Elton "Techniques And Initial Results From An X-Ray Laser Experiment Using Laser-Vaporized Copper Foil Plasmas", Proc. SPIE 0664, High Intensity Laser Processes, (21 October 1986); https://doi.org/10.1117/12.938717
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