STUDY OF RADIATION RESISTANCE OF DIELECTRIC COATING DEPOSITED ON OPTICAL SURFACE
ITMO University, Saint Petersburg, 197101, Russian Federation; senior research ascientist
V. S. Ermolaev
ITMO University, Department of Laser Technologies and Systems; Engineer
A. N. Sergeev
ITMO University, Saint Petersburg, 197101, Russian Federation; assistant
M. V. Puzyk
Herzen State Pedagogical University of Russia, Department of Inorganic Chemistry, St. Petersburg;
Abstract. A method for laser induced damage (LID) threshold measurement both within volume of transparent dielectrics and at surface of high-energy laser optical components is proposed. The technique makes it possible to determine the optical breakdown statistics in a chosen area of optical element for single-shot exposure and for accumulation regime. A technique of additional chemical-mechanical surface polishing is proposed, the LID threshold for coatings of optical components with surfaces subjected to the additional processing is measured and compared with regular treatment.
Keywords: radiation resistance, transparent dielectric, laser-induced breakdown, surface finishing.