Characterization of HR coatings for the megajoule laser transport mirrors

Anne Fornier; C. Cordillot; D. Bernardino; Odile Lam; Andre Roussel; B. Pinot; Bernard Geenen; Herve Leplan; W. Alexandre

doi:10.1117/12.274240

13 May 1997 Characterization of HR coatings for the megajoule laser transport mirrors

Anne Fornier, C. Cordillot, D. Bernardino, Odile Lam, Andre Roussel, B. Pinot, Bernard Geenen, Herve Leplan, W. Alexandre

Author Affiliations +

Proceedings Volume 2966, Laser-Induced Damage in Optical Materials: 1996; (1997) https://doi.org/10.1117/12.274240
Event: Laser-Induced Damage in Optical Materials: 1996, 1996, Boulder, CO, United States

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.

Citation Download Citation

Anne Fornier, C. Cordillot, D. Bernardino, Odile Lam, Andre Roussel, B. Pinot, Bernard Geenen, Herve Leplan, and W. Alexandre "Characterization of HR coatings for the megajoule laser transport mirrors", Proc. SPIE 2966, Laser-Induced Damage in Optical Materials: 1996, (13 May 1997); https://doi.org/10.1117/12.274240

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