Determination of the thermal conductivity of optical coatings using photothermal deflection technique and finite-element calculations

Rene Krupka; Adolf Giesen

doi:10.1117/12.259940

20 November 1996 Determination of the thermal conductivity of optical coatings using photothermal deflection technique and finite-element calculations

Rene Krupka, Adolf Giesen

Author Affiliations +

Proceedings Volume 2870, Third International Workshop on Laser Beam and Optics Characterization; (1996) https://doi.org/10.1117/12.259940
Event: Third International Workshop on Laser Beam and Optics Characterization, 1996, Quebec City, Canada

Abstract

Photothermal deflection measurements on optical components for 10.6 micrometer are presented. This technique is used to measure the photo induced deformation of the coated surface. The experimental results are compared to finite element calculations which allows the determination of the temperature and deformation profile at every point on the surface and within the sample. This comparison allows the determination of the thermal conductivity of the coatings. Although in the finite element calculations the coatings are approximated as only one single layer, we find a good agreement with the experimental results. The thermal conductivity of typical coated copper mirrors for 10.6 micrometer is found to be up to an order of magnitude lower than those of the corresponding bulk material.

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Rene Krupka and Adolf Giesen "Determination of the thermal conductivity of optical coatings using photothermal deflection technique and finite-element calculations", Proc. SPIE 2870, Third International Workshop on Laser Beam and Optics Characterization, (20 November 1996); https://doi.org/10.1117/12.259940

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