Relevance of the choice of diagnostic methods to investigate laser damage resistance in optical material

Jean-Yves Natoli; Frank Wagner; Laurent Gallais; Mireille Commandré

doi:10.1117/12.910429

12 January 2012 Relevance of the choice of diagnostic methods to investigate laser damage resistance in optical material

Jean-Yves Natoli, Frank Wagner, Laurent Gallais, Mireille Commandré

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Proceedings Volume 8206, Pacific Rim Laser Damage 2011: Optical Materials for High Power Lasers; 82061J (2012) https://doi.org/10.1117/12.910429
Event: Pacific Rim Laser Damage Symposium: Optical Materials for High Power Lasers, 2011, Shanghai, China

Abstract

Laser induced damage in optical material in nanosecond regime is widely attributed to local precursors in range of nanometer to micrometer size. The damage precursors nature strongly depends on materials (coatings, non linear crystals, substrates,..), breakdown location (bulk, surface, interface) and irradiation parameters (wavelength, pulse duration...). The weakness of knowledge on parameters as sizes, densities and natures of precursors, let think that the choice of the diagnostic method which reveals laser damage has to be adapted to each situation of irradiation. Concerning the LIDT determination, destructive methods are usually involved: we can cite full size test using the "real" final configuration of irradiation, raster scan method using a focused laser beam allowing laboratory test and statistic approach allowing study with different beam sizes in order to probe the material homogeneity in terms of precursors. This multi-scale approaches give relevant information on material properties regarding high power laser irradiation. In order to investigate the laser damage initiation mechanisms, it appears necessary to involve non-destructive diagnostics. These diagnostics permit to highlight modifications linked to precursors before material breakdown. The main difficulty here is the local character of the diagnostic added to the low density of initiating center. A multi-scale approach is thus also well adapted to the non-destructive case. Interest of diagnostics as local fluorescence and photothermal deflexion both correlated with LIDT results will be discussed. To illustrate the purpose, examples on non linear crystals and coatings will be shown.

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Jean-Yves Natoli, Frank Wagner, Laurent Gallais, and Mireille Commandré "Relevance of the choice of diagnostic methods to investigate laser damage resistance in optical material", Proc. SPIE 8206, Pacific Rim Laser Damage 2011: Optical Materials for High Power Lasers, 82061J (12 January 2012); https://doi.org/10.1117/12.910429

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KEYWORDS

Laser induced damage

Diagnostics

Luminescence

Absorption

Crystals

Nondestructive evaluation

Silica

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