Characterization of multilayer optical coatings: damage threshold/local absorption correlation

Anne Fornier; C. Cordillot; D. Bernardino; O. Lam; Andre Roussel; Claude Amra; Ludovic Escoubas; Gerard Albrand; Mireille Commandre; Pierre J. Roche

doi:10.1117/12.294284

8 December 1997 Characterization of multilayer optical coatings: damage threshold/local absorption correlation

Anne Fornier, C. Cordillot, D. Bernardino, O. Lam, Andre Roussel, Claude Amra, Ludovic Escoubas, Gerard Albrand, Mireille Commandre, Pierre J. Roche

Author Affiliations +

Proceedings Volume 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference; (1997) https://doi.org/10.1117/12.294284
Event: Second International Conference on Solid State Lasers for Application to ICF, 1996, Paris, France

Abstract

It is now accepted that absorption phenomena are not directly responsible for the flux resistance of multilayer optical components exposed to pulsed lasers. However, such studies involved `overall' absorption by components, which is now known does not characterize an intrinsic property of thin film materials. If the absorption of thin film materials is mapped by exciting different zones less than 100 micrometers in diameter, a clear disparity in absorption thresholds is shown up which must be attributed to heterogeneity in the imaginary refractive index or the extinction coefficient. The heterogeneity of absorption may be related to the incorporation of foreign matter in the materials or to dislocations, nodules, etc... Under these circumstances a key issue is whether the damage thresholds can be correlated with these microscopic absorption sites. We present the equipment used for carrying out the different types of characterization in this study: absorption and diffusion mapping, damage threshold measurements, and analysis by atomic force microscopy. An attempt is made to correlate these different results.

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Anne Fornier, C. Cordillot, D. Bernardino, O. Lam, Andre Roussel, Claude Amra, Ludovic Escoubas, Gerard Albrand, Mireille Commandre, and Pierre J. Roche "Characterization of multilayer optical coatings: damage threshold/local absorption correlation", Proc. SPIE 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, (8 December 1997); https://doi.org/10.1117/12.294284

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