This work focuses on the optimization of a high reflector design for operation at 1 μm wavelength to achieve a high laser
damage threshold when tested at pulse durations of 0.19 and 4 ns. Different designs that modify the standing wave
electric field distribution of a quarter wave Ta2O5/SiO2 multilayer dielectric coating are considered. It is found that the
addition of an extra SiO2 quarter wave to reduce the peak electric field in the coating, increases the 50% damage
probability by over 100% at both pulse durations.
We have investigated the properties and laser damage behavior of Ta2O5/SiO2 quarter wave stacks designed for λ=1
μm operation by substituting the Ta2O5 layer by either Y2O3 or HfO2 and the SiO2 by Al2O3 in the top 3 pairs of the
multilayer stack. The high reflectors were deposited by dual ion beam sputtering. Laser damage at 1 μm using 350
ps showed enhanced performance when the Ta2O5/SiO2 stack had HfO2 or Y2O3 in its top few pairs.
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