20 April 1998 Loss of transmittance in fluoropolymer films due to laser-induced damage at 1053 and 351 nm
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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.
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Pamela K. Whitman, David Milam, Mary A. Norton, 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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KEYWORDS
Transmittance

Laser induced damage

Laser damage threshold

Laser optics

Modulation

X-ray lasers

X-ray optics

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