Characterization of BG28 and KG3 filter glass for Drive Diagnostic Attenuators

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BG28 and KG3 filter glasses were tested for use as attenuators in the NIF drive diagnostic (DrD) systems. Tests were performed in the Optical Sciences Laser facility with a 351 nm, 2-step, 3-nsec pulse at fluences ranging up to {approx} 1 J/cm{sup 2}. Single-shot measurements showed no solarization when the samples were allowed to relax for a week after exposure. KG3 filters exhibited no luminescence and no transient pulse distortion. BG28 filters luminesced appreciably and imposed a 'droop' (similar to 'square-pulse distortion') on the signals. The droop parameter is estimated at 0.50 {+-} 0.11 cm{sup 2}/J. Droop is explained in ... continued below

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Page, R H; Weiland, T & Folta, J November 30, 2007.

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Description

BG28 and KG3 filter glasses were tested for use as attenuators in the NIF drive diagnostic (DrD) systems. Tests were performed in the Optical Sciences Laser facility with a 351 nm, 2-step, 3-nsec pulse at fluences ranging up to {approx} 1 J/cm{sup 2}. Single-shot measurements showed no solarization when the samples were allowed to relax for a week after exposure. KG3 filters exhibited no luminescence and no transient pulse distortion. BG28 filters luminesced appreciably and imposed a 'droop' (similar to 'square-pulse distortion') on the signals. The droop parameter is estimated at 0.50 {+-} 0.11 cm{sup 2}/J. Droop is explained in terms of known copper-doped-glass spectroscopy and kinetics (buildup of triplet-state populations, with excited-state absorption). Simulation of the distortion ({approx}1.6%) expected on a 1.8 MJ Haan pulse led to a minor redesign of the Drive Diagnostic with reduced fluence on the BG28 filters to reduce the droop distortion to 0.5%.

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PDF-file: 22 pages; size: 1.6 Mbytes

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  • Report No.: UCRL-TR-237012
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/924016 | External Link
  • Office of Scientific & Technical Information Report Number: 924016
  • Archival Resource Key: ark:/67531/metadc897051

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  • November 30, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 2, 2016, 9:05 p.m.

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Page, R H; Weiland, T & Folta, J. Characterization of BG28 and KG3 filter glass for Drive Diagnostic Attenuators, report, November 30, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc897051/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.