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Proceedings Paper

Correlation between laser-induced damage and nanosized absorbing defects
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Paper Abstract

In the context of high power laser applications like the French "Laser Megajoule" or the "National Ignition Facility" in the United States, laser-induced-damage in fused silica appears to be a limitation. Although it has been established that nano-sized defects are suspected to be responsible of the damage initiation in optical components, the induced-breakdown process is still unknown. The specific apparatus developed at the Institut Fresnel permits to study in real time the laser interaction on an isolated absorbing defect (around 100 nm): Indeed the coupling of a nanosecond focused laser (beam diameter about 10μm) and a high resolution photothermal microscope (beam diameter 1μm) in a unique facility permits to highlight the evolution of the local absorption of the defect versus irradiation energy density. Furthermore, the morphology of this modification is followed thanks to a "refraction mapping" (photothermal deflection measured at frequency 0). An in-situ dark field microscope and an ex-situ AFM complete the observations. In order to simulate the presence of the nano-defects, engineered sub-micronic gold particles (100-600 nm) were embedded in silica samples. The whole observations contribute in the understanding of the different stages of the damage initiation and more particularly, a determination of a "pre-damage" threshold can be performed.

Paper Details

Date Published: 25 February 2004
PDF: 6 pages
Proc. SPIE 5250, Advances in Optical Thin Films, (25 February 2004); doi: 10.1117/12.513373
Show Author Affiliations
Bertrand Bertussi, Institut Fresnel, CNRS-ENSPM (France)
Jean-Yves Natoli, Institut Fresnel, CNRS-ENSPM (France)
Annelise During, Institut Fresnel, CNRS-ENSPM (France)
Mireille Commandre, Institut Fresnel, CNRS-ENSPM (France)
Laurent Gallais, Institut Fresnel, CNRS-ENSPM (France)
Jean Luc Rullier, CEA-DIF (France)
Herve Bercegol, CEA-CESTA (France)
Philippe Bouchut, CEA-LETI (France)

Published in SPIE Proceedings Vol. 5250:
Advances in Optical Thin Films
Claude Amra; Norbert Kaiser; H. Angus Macleod, Editor(s)

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