Loss of transmittance in fluoropolymer films due to laser-induced damage at 1053 and 351-nm

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Thick fluoropolymer films are being evaluated as a potential `disposable` debris shield to protect high-peak-power laser optics from x-ray and target debris generated in inertial-confinement fusion-ignition experiments, Two obstacles to implementation are optical uniformity and damage threshold. To understand the damage characteristics, transmittance of single 1053- or 351-nm laser pulses has been measured for commercial fluoropolymer films in vacuum. Samples were tested at fluences up to 105 J/cm2 at 1053-nm and 13 J/cm2 at 351-nm. Both the total transmitted energy for a single shot and the temporal energy transmittance profile during the shot were measured as a function of fluence. ... continued below

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Whitman, P.; Milam, D.; Norton, M. & Sell, W. December 1, 1997.

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Thick fluoropolymer films are being evaluated as a potential `disposable` debris shield to protect high-peak-power laser optics from x-ray and target debris generated in inertial-confinement fusion-ignition experiments, Two obstacles to implementation are optical uniformity and damage threshold. To understand the damage characteristics, transmittance of single 1053- or 351-nm laser pulses has been measured for commercial fluoropolymer films in vacuum. Samples were tested at fluences up to 105 J/cm2 at 1053-nm and 13 J/cm2 at 351-nm. Both the total transmitted energy for a single shot and the temporal energy transmittance profile during the shot were measured as a function of fluence. In addition, the total focusable transmitted energy was recorded for 351 -nm pulses. Results show that transmittance decreases slowly during a single-pulse irradiation, allowing much of the energy to be transmitted at fluences which cause noticeable degradation to the film. The film transmits greater than 90% of the 351-nm energy delivered in a beam with spatial average fluence of 8 J/cm2 with modulation up to 15 J/cm2. For 1053-nm laser light, the films do not begin to exhibit noticeable transmittance loss until average fluences exceed 40 J/cm2.

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10 p.

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OSTI as DE98057744

Other: FDE: PDF; PL:

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  • 29. annual Boulder damage symposium on optical materials for high power lasers, Boulder, CO (United States), 6-8 Oct 1997

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  • Other: DE98057744
  • Report No.: UCRL-JC--128090
  • Report No.: CONF-9710116--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 304560
  • Archival Resource Key: ark:/67531/metadc675343

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 1, 1997

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  • July 25, 2015, 2:20 a.m.

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  • April 6, 2017, 6:27 p.m.

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Whitman, P.; Milam, D.; Norton, M. & Sell, W. Loss of transmittance in fluoropolymer films due to laser-induced damage at 1053 and 351-nm, article, December 1, 1997; California. (digital.library.unt.edu/ark:/67531/metadc675343/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.