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Proceedings Paper

Loss of transmittance in fluoropolymer films due to laser-induced damage at 1053 and 351 nm
Author(s): Pamela K. Whitman; David Milam; Mary A. Norton; Walter D. Sell
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Paper Abstract

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 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 percent 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.

Paper Details

Date Published: 20 April 1998
PDF: 7 pages
Proc. SPIE 3244, Laser-Induced Damage in Optical Materials: 1997, (20 April 1998); doi: 10.1117/12.306998
Show Author Affiliations
Pamela K. Whitman, Lawrence Livermore National Lab. (United States)
David Milam, Lawrence Livermore National Lab. (United States)
Mary A. Norton, Lawrence Livermore National Lab. (United States)
Walter D. Sell, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 3244:
Laser-Induced Damage in Optical Materials: 1997
Gregory J. Exarhos; Arthur H. Guenther; Mark R. Kozlowski; M. J. Soileau, Editor(s)

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