7 April 1999 Laser-induced damage of absorbing and diffusing glass surfaces under IR and UV irradiation
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Abstract
In high peak power lasers used for inertial confinement fusion experiments, scattered and reflected light can carry sufficient energy to ablate metal structures or even damage other optics. Absorbing and diffuse scattering materials are required to manage the 'ghosts', stimulated Raman scattering (SRS) and unconverted light in the laser chain and target chamber. Absorbing and diffuse scattering glasses were investigated for use in the NIF target chamber to safely dissipate up 60-80 J/cm2 1053-nm light while also withstanding up to 2 J/cm2 of soft x-ray. In addition these glasses were evaluated for use at 1053-nm and 351-nm to dissipate stray light and to absorb stimulated Raman scattering from the conversion crystals. Glass samples with surfaces ranging from specular to highly scattering were evaluated. The morphologies of laser damage at 1064 nm and 355 nm were characterized by Nomarski optical microscopy. Laser damage was quantified by measuring mass loss. Surface treatment and bulk absorption coefficient were the two material properties most strongly correlated to laser damage. Etched and sandblasted surfaces always had lower damage threshold than their specular counterparts. Reducing rear surface fluence either by bulk absorption or scattering at the input surface delayed the onset of catastrophic failure under extreme conditions.
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Pamela K. Whitman, Pamela K. Whitman, K. Bletzer, K. Bletzer, James L. Hendrix, James L. Hendrix, Francois Y. Genin, Francois Y. Genin, M. Hester, M. Hester, J. M. Yoshiyama, J. M. Yoshiyama, } "Laser-induced damage of absorbing and diffusing glass surfaces under IR and UV irradiation", Proc. SPIE 3578, Laser-Induced Damage in Optical Materials: 1998, (7 April 1999); doi: 10.1117/12.344421; https://doi.org/10.1117/12.344421
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