Influence of thermal substrate properties on the damage threshold of UV coatings

Holger Blaschke; Sven Martin; Andreas Morak; Ch. Koenigsdoerffer; M. Roth; Bincheng Li; Eberhard Welsch; Roland Thielsch; Norbert Kaiser

doi:10.1117/12.344387

7 April 1999 Influence of thermal substrate properties on the damage threshold of UV coatings

Holger Blaschke, Sven Martin, Andreas Morak, Ch. Koenigsdoerffer, M. Roth, Bincheng Li, Eberhard Welsch, Roland Thielsch, Norbert Kaiser

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Proceedings Volume 3578, Laser-Induced Damage in Optical Materials: 1998; (1999) https://doi.org/10.1117/12.344387
Event: Laser-Induced Damage in Optical Materials: 1998, 1998, Boulder, CO, United States

Abstract

The thermal decay of surface temperature has been calculated and measured on Al₂O₃/SiO₂ coatings by using photothermal technique near damage threshold fluence. It could be shown that under certain conditions the decay times (tau) has been found to be in the order of some microseconds. This fact gives no explanation of the measured decrease of threshold fluence in some cases for higher repetition rates and shot numbers on Al₂O₃/SiO₂ and HfO₂/SiO₂ multilayers for (lambda) equals 248nm. Furthermore, it could not be found any influence of the substrate materials. Thus, other than thermal accumulation is responsible for the lowered damage threshold by increasing repetition rate. Additionally, performed calculations of the thermal decay using 20ns, 248nm laser excitation confirm the experimental results. Even in the case of Al₂O₃/SiO₂ coatings on copper no effect of the substrate as a heat sink could be measured. For HfO₂/SiO₂ coatings the behavior is in accordance with the fact that the thermal conductivity of HfO₂ films is markedly lowered compared to the bulk value.

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Holger Blaschke, Sven Martin, Andreas Morak, Ch. Koenigsdoerffer, M. Roth, Bincheng Li, Eberhard Welsch, Roland Thielsch, and Norbert Kaiser "Influence of thermal substrate properties on the damage threshold of UV coatings", Proc. SPIE 3578, Laser-Induced Damage in Optical Materials: 1998, (7 April 1999); https://doi.org/10.1117/12.344387

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KEYWORDS

Laser damage threshold

Copper

Aluminum

Quartz

Thermal effects

Optical coatings

Temperature metrology

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