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Large area laser conditioning of dielectiic thin film mirrors
Author(s): M. R. Kozlowski
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Paper 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.

Paper Details

Date Published: 2 October 2017
PDF: 17 pages
Proc. SPIE 1438, Laser-Induced Damage in Optical Materials 1989, 143811 (2 October 2017); doi: 10.1117/12.2294446
Show Author Affiliations
M. R. Kozlowski, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 1438:
Laser-Induced Damage in Optical Materials 1989
Harold E. Bennett; Lloyd L. Chase; Arthur H. Guenther; Brian Emerson Newnam; M. J. Soileau, Editor(s)

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