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Strategies to increase laser damage performance of Ta2O5/SiO2 mirrors by modifications of the top layer design

Abstract

Ta2O5/SiO2 high reflection (HR) interference coatings for λ1μm offer superior performance at high irradiance conditions. However, these coatings are not good candidates for high peak power conditions in comparison to HfO2/SiO2 multilayer stacks. Here we show that the modification of the top layers design of a quarter wave Ta2O5/SiO2 high reflector leads to 4–5 fold increase in the laser damage fluence compared to a quarter wave (Ta2O5/SiO2)15 when tested at λ=1.03μm using pulse durations of 0.19 and 4 ns and peak power densities of 43.5 and 216GW/cm2. One of the designs achieved a laser damage threshold fluence of 174J/cm2 at 4 ns, which is 10% higher than that of a HfO2/SiO2 quarter wave design.

© 2016 Optical Society of America

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