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Proceedings Paper

Generation of defects with diamond and silica particles inside high-reflection coatings: influence on the laser damage threshold
Author(s): Marc Poulingue; Jean DiJon; B. Rafin; Herve Leplan; Michel Ignat
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Paper Abstract

High power lasers at 1.06 micrometers wavelength like the French 'Megajoule' program require large area mirrors made of alternative layers of HfO2 and SiO2 with high damage threshold. It has ben already identified that nodular defects have a significant role in the activation of laser damage. The purpose of this paper is to study experimentally the role played by the size and the nature of the seed on the critical behavior of the nodular defects under laser irradiation. Artificial nodules have been grown with careful control of location and seed size. these nodules have been generated with diamond and silica seeds. Silica seeds of four different sizes have been used. A method which minimizes clusters of particles has been successfully used. With this method, we have obtained defects with a sharp size distribution. These samples have been tested on our automatic damage test bench in various modes. The thresholds between polluted and unpolluted mirrors are discussed according to the size and the nature of the seeds. The damage sites are observed with a scanning electron microscope. These experimental results are compared with a damage model.

Paper Details

Date Published: 7 September 1999
PDF: 12 pages
Proc. SPIE 3738, Advances in Optical Interference Coatings, (7 September 1999); doi: 10.1117/12.360096
Show Author Affiliations
Marc Poulingue, REOSC (France)
Jean DiJon, CEA-LETI (France)
B. Rafin, CEA-LETI (France)
Herve Leplan, REOSC (France)
Michel Ignat, Institut National Polytechnique de Grenoble (France)


Published in SPIE Proceedings Vol. 3738:
Advances in Optical Interference Coatings
Claude Amra; H. Angus Macleod, Editor(s)

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