Kostenyukova O. Nonlinear optical materials based on the KDP dielectric matrix with incorporated organic molecules.

Thesis is devoted to the development to the study of the patterns of formation, structure and functional properties of KDP crystals doped organic molecules. For the first time, the KDP crystals with incorporated organic molecules of N, N'-dimethyl urea (NN'DU), L-arginine phosphate (LAP) and L-arginine have been grown. The laboratory method for obtaining KDP:L-arg crystals is developed. The laws of influence of dopants on the process of cultivation, morphology and structural perfection of crystals are investigated. It is shown that doping with organic molecules NN'DU, LAP and L-arg leads to an increase in the efficiency SHG of the KDP crystal in comparison with a pure crystal ~ 2-3.5 times. It has been established that the efficiency of the laser radiation conversion is always maximal in the sector {100}. Most likely, this is due to the fact that the formation of new hydrogen bonds in the structure of the crystal due to the collective interaction of organic molecules with a matrix occurs predominantly in the sector of prisms. The influence of amino acids molecules on mechanical strength and character of laser destruction of KDP crystals was studied. It is established that changes in the mechanical and laser strength of doped crystals that are observed are mainly correlated with each other. Key words: dihydrophasphate, composite materials, organic molecules, mechanical properties, laser damage threshold, second harmonic generation.