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24 June 1993 Effect of laser irradiation conditions on the optical damage resistance of dielectric coatings
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We report the measured damage thresholds of dielectric coatings of optical elements in the 120 TW iodine laser system ISKRA-5 when irradiated by pulses with approximately 0.5 ns duration at 1315 nm. The main part of high-reflection coatings is characterized by the damage thresholds from 10 to 30 J/cm2. The damage thresholds of antireflection coatings for most components are significantly lower, namely: from 3 to 8 J/cm2. It has been shown that the damage resistance of high-reflection coatings is greatly dependent on whether the coating is on the entrance or exit surface to radiation, whereas for antireflection coatings and quarter-wave SiO2 films such dependence is practically absent. The damage threshold of polarization coatings depends on radiation polarization. The obtained results are explained by a mechanism connected with a preferential concentration of absorbing defects, causing damage at the boundary of a coating and substrate.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. V. Belotserkovets, A. V. Bessarab, Gennadi A. Kirillov, Y. V. Kuratov, D. V. Pavlov, and V. T. Punin "Effect of laser irradiation conditions on the optical damage resistance of dielectric coatings", Proc. SPIE 1848, 24th Annual Boulder Damage Symposium Proceedings -- Laser-Induced Damage in Optical Materials: 1992, (24 June 1993);

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