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 LiNbO3, BaNaNbO5, LiO3, 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 CO2 laser pulses. The analysis of the obtained results with account for the chemical reaction thermodynamics, thermotension and other factors is presented.
The analysis of the under-threshold phenomena in the surface layer of the lithium niobate under intense laser irradiation was carried out. The accumulation effect leading to the laser damage was considered in the framework of the influence of the particle emission from the investigated sample surface on the electronic processes in the surface layer. The model of the oxygen depletion of the surface due to the intense nanosecond laser pulses is suggested. The influence of the absorbed surface layer on this process is considered. This model is in agreement with the experimental data of the laser damage threshold dependence on the oxidizing/reduction properties of the environment.
The possibility of the application of the erosion plume products induced gas discharge for the registration of the laser damage of the optical materials is considered. The method is shown to be convenient for the application in the automatic sample testing installations.
Investigations devoted to the silicate glass film deposition from gas discharge initiated by laser plasma are presented. Tetraethylorthosilicate (TEOS) is introduced in the gas composition. It was the source of the SiO2. Addition of the other components of the deposited coatings comes from the laser plume of the ablated solid state target.
The analysis of the problems arising when the KTP crystals are used for the second harmonic generation in the case of the high peak and high average power laser radiation is presented. The main attention is paid for the investigation of the radiation absorption including the induced one.
Diamond-like films were produced by laser ablation of glass-carbon target in the presence of residual gas (Ar) in a reaction chamber. It appears that the band gap value of the films deposited in this case is more than 20% greater than that of the films deposited at high vacuum. This influence of a gas on optical properties of the produced coatings was explained in the framework of a simple mechanical model.
A new method of diamond-like film deposition using laser-initiated discharge of benzol vapor is described. The investigation of the discharge parameters was carried out. Dependence of these parameters on characteristics of laser radiation, electric field, and vapor pressure was obtained. It has been shown that this method allows us to produce the coatings with low optical absorption.
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