2D spatial gain profiles in multiple-pulse driven Ne-like Ge lasers

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In this paper, we present the direct spatial measurement of the two-dimensional gain profiles for the Ne-like Ge 196 Å laser line using a slab target illuminated by the multiple pulse technique. To understand the spatial dependence for Ge plasmas driven by a series of 100 ps pulses 400 ps apart we did a series of Nova experiments backlighting short Ge amplifiers. Two-dimensional, high-resolution, spatial images of the 196 Å laser emission from the output aperture of the amplifiers were measured to determine the spatial position of the gain. The amplifier lengths were chosen to be short enough to avoid ... continued below

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Dunn, J; Li, Y; Nilsen, J & Osterheld, A L September 21, 1998.

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In this paper, we present the direct spatial measurement of the two-dimensional gain profiles for the Ne-like Ge 196 Å laser line using a slab target illuminated by the multiple pulse technique. To understand the spatial dependence for Ge plasmas driven by a series of 100 ps pulses 400 ps apart we did a series of Nova experiments backlighting short Ge amplifiers. Two-dimensional, high-resolution, spatial images of the 196 Å laser emission from the output aperture of the amplifiers were measured to determine the spatial position of the gain. The amplifier lengths were chosen to be short enough to avoid the significant refraction effects which have dominated the analysis of previous near field imaging experiments. To assure good temporal overlap, the traveling wave geometry was used to illuminate both the amplifier and backlighter. The amplifier design included a wire fiducial that provided an absolute spatial reference and avoided the usual difficulty of determining the location of the target surface. We compare the measured spatial gain profiles with simulations done using LASNEX, which calculates the hydrodynamic evolution of the plasma, and XRASER, which uses the temperatures and densities from LASNEX to do the gain and kinetics calculations.

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  • 6th International Conference on X-Ray Lasers, Kyoto, Japan, August 31-September 4, 1998

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  • Other: DE00002648
  • Report No.: UCRL-JC-130947
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 2648
  • Archival Resource Key: ark:/67531/metadc671417

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  • September 21, 1998

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  • June 29, 2015, 9:42 p.m.

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  • May 6, 2016, 8:56 p.m.

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Dunn, J; Li, Y; Nilsen, J & Osterheld, A L. 2D spatial gain profiles in multiple-pulse driven Ne-like Ge lasers, article, September 21, 1998; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc671417/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.