20 April 1998 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 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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Pamela K. Whitman, Pamela K. Whitman, David Milam, David Milam, Mary A. Norton, Mary A. Norton, Walter D. Sell, Walter D. Sell, } "Loss of transmittance in fluoropolymer films due to laser-induced damage at 1053 and 351 nm", Proc. SPIE 3244, Laser-Induced Damage in Optical Materials: 1997, (20 April 1998); doi: 10.1117/12.306998; https://doi.org/10.1117/12.306998

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