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Proceedings Paper

Morphologies of laser-induced damage in hafnia-silica multilayer mirror and polarizer coatings
Author(s): Francois Y. Genin; Christopher J. Stolz
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Paper Abstract

Hafnia-silica multilayer mirrors and polarizers were deposited by e-beam evaporation onto BK7 glass substrates. The mirrors and polarizers were coated for operation at a wavelength of 1053 nm at 45 degrees and at Brewster's angle (56 degrees), respectively. They were tested with a single 3-ns laser pulse. The morphology of the laser-induced damage was characterized by optical and scanning electron microscopy. Four distinct damage morphologies were found: pits, flat bottom pits, scalds, and delaminates. The pits and flat bottom pits (less than 30 micrometer in diameter) were detected at lower fluences (as low as 5 J/cm2). The pits seemed to result from ejection of nodular defects by causing local enhancement of the electric field. Scalds and delaminates could be observed at higher fluences (above 13 J/cm2) and seemed to result from the formation of plasmas on the surface. These damage types often originated at pits and were typically less than 300 micrometer in diameter; their size increased almost linearly with fluence. Finally, the effects of the damage on the characteristics of the beam (reflectivity degradation and phase modulations) were measured.

Paper Details

Date Published: 20 November 1996
PDF: 10 pages
Proc. SPIE 2870, Third International Workshop on Laser Beam and Optics Characterization, (20 November 1996); doi: 10.1117/12.259929
Show Author Affiliations
Francois Y. Genin, Lawrence Livermore National Lab. (United States)
Christopher J. Stolz, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 2870:
Third International Workshop on Laser Beam and Optics Characterization
Michel Morin; Adolf Giesen, Editor(s)

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