Interaction of laser radiation with matter. Laser plasma

The effect of laser radiation on the laser damage resistance of dielectric coatings

A. V. Belotserkovets, A. V. Bessarab, Yu. V. Kuratov, D. V. Pavlov, V. T. Punin


Abstract: The effect of pulses of laser radiation at a wavelength λ = 1315 nm with durations in the range 0.5–0.7 ns on the laser damage resistance of high-reflection, antireflection, and polarizing coatings and quarter-wave plates made from SiO₂ is measured and discussed. The study includes various impact geometries and radiation polarizations. It is shown that for high-reflection coatings the damage resistance depends strongly on whether the coating is at the entrance or exit surface, whereas for antireflection and single-layer coatings there is essentially no such dependence. The threshold for destruction of polarizing coatings depends on the polarization of the radiation. These results are explained within the framework of a mechanism according to which the microscopic absorbing inhomogeneities which initiate the destruction are concentrated predominantly at the boundary between the coating and substrate.

UDC: 621.373.826:681.7.064

PACS: 42.79.Wc, 61.80.Ba, 42.79.Ci

Received: 02.06.1992

 English version: Soviet Journal of Quantum Electronics, 1992, 22:12, 1107–1108

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