1 November 1990 Large area laser conditioning of dielectiic thin film mirrors
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Abstract
The laser conditioning of dielectric thin film HR coatings has been studied as a practical method for the improvement of the damage thresholds of large area ( 1.1 m dia.) high power 1064 nm laser mirrors on the LLNL 120 kJ, 100 TW Nova laser system. Both Hf02/Si02 and ZrOJSiO2HR coatings were conditioned by rastering with a small (-0.2 mm) diameter beam from a pulsed (18 Hz, 8 ns) Nd-YAG laser (1064 nm), The samples were rastered at various fluences below the unconditioned damage threshold and subsequently damage tested. Large area conditioning studies were also performed using a large aperture beam of the Nova laser. The laser conditioning effect was found to be permanent. Improvements in damage threshold due to conditioning were as high as a factor of 2.7 and were dependent on the conditioning parameters. A model for the conditioning effect is proposed based on the emptying of electronic defect levels within the bandgap of the dielectric materials.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. R. Kozlowski, M. R. Kozlowski, } "Large area laser conditioning of dielectiic thin film mirrors", Proc. SPIE 1438, Laser-Induced Damage in Optical Materials 1989, 143811 (1 November 1990); doi: 10.1117/12.2294446; https://doi.org/10.1117/12.2294446
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