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LASER-INDUCED DAMAGE THRESHOLD OF REFLECTIVE DIELECTRIC COATINGS ON ABSORBING SUBSTRATE

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Several features of HfO2/SiO2 and Ta2O5/SiO2 coatings deposited on absorbing substrate of single-crystal silicon carbide (SiC) are revealed to cause a decrease in their laser-induced damage threshold. It has been experimentally shown that in the presence of transverse micro displacement of the beam during the measurements, the radiation strength of the sample decreases in 2–3 times. Using the heat transfer equation and the finite element method in the CAE (computer-aided engineering) system, the effects of laser radiation with transverse beam displacement is simulated, and the dynamics of temperature changes and induced thermal stresses inside the samples are evaluated.

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