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Proceedings Paper

Characterization of HR coatings for the megajoule laser transport mirrors
Author(s): Anne Fornier; C. Cordillot; D. Bernardino; Odile Lam; Andre Roussel; B. Pinot; Bernard Geenen; Herve Leplan; W. Alexandre
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Paper Abstract

One of the concerns with the megajoule laser design is the laser-induced damage threshold of the transport mirrors. Earlier studies have shown that the main constraint on the laser damage threshold comes from nodules at the mirror surface. It is therefore important to restrict the number of such nodules. SFIM-ODS, in close collaboration with CEL-V, has initiated a special study to characterize these nodules as precisely as possible. The objective of the study is twofold: (1) to determine the origin of the nodules and subsequently to adapt the mirror fabrication process in order to limit their formation, (2) to analyze their shapes and dimensions in order to ascertain which nodules are critical for laser-induced damage. To understand the origin of the nodules and their effect on the laser damage threshold, the mirrors are characterized using various methods: (1) absorption and scatter mapping: does the presence of nodules result in specific absorption patterns, (2) surface analysis by atomic force microscopy: to characterize nodule shape and dimensions, (3) focused ion beam cutting of nodules: to locate the seed initiating the nodule and to characterize the seed shape and composition, (4) laser damage threshold measurements: to determine the laser damage threshold of them mirror and study the behavior of nodules under laser irradiation depending on their dimensions and shape.

Paper Details

Date Published: 13 May 1997
PDF: 15 pages
Proc. SPIE 2966, Laser-Induced Damage in Optical Materials: 1996, (13 May 1997); doi: 10.1117/12.274240
Show Author Affiliations
Anne Fornier, CEA/Limeil-Valenton (France)
C. Cordillot, CEA/Limeil-Valenton (France)
D. Bernardino, CEA/Limeil-Valenton (France)
Odile Lam, CEA/Limeil-Valenton (France)
Andre Roussel, CEA/Limeil-Valenton (France)
B. Pinot, SFIM-ODS (France)
Bernard Geenen, SFIM-ODS (France)
Herve Leplan, SFIM-ODS (France)
W. Alexandre, SFIM-ODS (France)

Published in SPIE Proceedings Vol. 2966:
Laser-Induced Damage in Optical Materials: 1996
Harold E. Bennett; Arthur H. Guenther; Mark R. Kozlowski; Brian Emerson Newnam; M. J. Soileau, Editor(s)

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