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Proceedings Paper

Thermal diffusion analysis in coated optical components for high-power lasers
Author(s): Paul E. Sterian; Tiberiu Visan; Laurentiu Tescan
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Paper Abstract

In referring to the damage in optical coated components for high power industrial lasers to major factors are important: the absorption coefficient of different layers and local defects acting as heat concentration. Serious damage may occur if overheat of the component develops during exposure to high laser radiation fields. By analyzing the heat diffusion is such structures one may predict the intensity of the laser beam close to the limit value where damages due to the overhead heat may occur. From the thermal point of view, the analysis of heat diffusion in thin films may be useful for using high thermal conductivity or high emissivity thin films for spreading out the heat. The thermal field inside a cylindrical optical component is shown into figure 1. The problem to be addressed at this point is that this analysis involves solving of the heat diffusion equation for the thin films and the substrate, the whole structure appearing as an inhomogeneous structure. The paper presents a new method to analyze the heat diffusion in coated materials by approximating the thermal parameters with constants both for the coating films and for the substrate, and by the first degree polynoms at the interface.

Paper Details

Date Published: 9 August 2002
PDF: 12 pages
Proc. SPIE 4762, ALT'01 International Conference on Advanced Laser Technologies, (9 August 2002); doi: 10.1117/12.478639
Show Author Affiliations
Paul E. Sterian, Univ. Politehnica of Bucharest (Romania)
Tiberiu Visan, Univ. Politehnica of Bucharest (Romania)
Laurentiu Tescan, Univ. Politehnica of Bucharest (Romania)

Published in SPIE Proceedings Vol. 4762:
ALT'01 International Conference on Advanced Laser Technologies
Dan C. Dumitras; Maria Dinescu; Vitali I. Konov, Editor(s)

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