Strategies to increase laser damage performance of Ta2O5/SiO2 mirrors by modifications of the top layer design
نویسندگان
چکیده
Ta2O5∕SiO2 high reflection (HR) interference coatings for λ ∼ 1 μm offer superior performance at high irradiance conditions. However, these coatings are not good candidates for high peak power conditions in comparison toHfO2∕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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