Investigation of the degradation of antireflection coatings of nonlinear crystal under the action of high-average-power laser radiation

摘要

Abstract: The analysis of the local heating role in the processes of the degradation of the antireflection coatings of the nonlinear crystals when they have been used in the CW and quasi-CW YAG laser was carried out. The broad sample range of the oxide, nitride and fluoride films deposited on the LiNbO$-3$/, BaNaNbO$-5$/, LiO$-3$/, KTP and BBO crystals was considered. Investigation of these samples was carried out under the intense heating of their surfaces by the action of the CO$-2$/ laser pulses. The analysis of the obtained results with account for the chemical reaction thermodynamics, thermotension and other factors is presented. !0