Ultrafast multipulse damage threshold of femtosecond high reflectors

Abstract

Laser-induced damage threshold is a fundamental figure of merit of femtosecond optical components used in large-scale laser systems. We tested a series of ultrafast mirrors featuring high band-gap dielectric materials as well as improved design and coating techniques. In a broad range of the damage test pulse train involving between 10 and 100,000 pulses (40 fs, 800 nm), pure dielectric high reflectors exhibit around $1.5\mathrm{J}/{\mathrm{cm}}^2$ and hybrid Ag–multilayer mirrors can exhibit well above $1.2\mathrm{J}/{\mathrm{cm}}^2$ damage threshold. In addition, a reference antireflection coating exceeded $2\mathrm{J}/{\mathrm{cm}}^2$. Damage threshold dependence on the number of pulses was similar for all optics involved.

© 2018 Optical Society of America

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