Abstract

Ta2O5/SiO2 high reflection (HR) interference coatings for λ1  μm 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=1.03  μm using pulse durations of 0.19 and 4 ns and peak power densities of 43.5 and 216  GW/cm2. One of the designs achieved a laser damage threshold fluence of 174  J/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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