Thermal diffusion analysis in coated optical components for high-power lasers

Paul E. Sterian; Tiberiu Visan; Laurentiu Tescan

doi:10.1117/12.478639

9 August 2002 Thermal diffusion analysis in coated optical components for high-power lasers

Paul E. Sterian, Tiberiu Visan, Laurentiu Tescan

Proceedings Volume 4762, ALT'01 International Conference on Advanced Laser Technologies; (2002) https://doi.org/10.1117/12.478639
Event: International Conference on: Advanced Laser Technologies (ALT'01), 2001, Constanta, Romania

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.

Citation Download Citation

Paul E. Sterian, Tiberiu Visan, and Laurentiu Tescan "Thermal diffusion analysis in coated optical components for high-power lasers", Proc. SPIE 4762, ALT'01 International Conference on Advanced Laser Technologies, (9 August 2002); https://doi.org/10.1117/12.478639

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