Bohdan Kulyk

The new methacrylic monomer has been synthesized and then radically polymerised. The results of photochemical and optical activities of the corresponding polymer are presented herein. The third-order nonlinear optical response of spin deposited thin films has been investigated by means of Maker fringes technique using 30 ps laser pulses at a fundamental wavelength of 1064 nm.

KDP/Al ₂ O ₃ crystalline nanocomposite was obtained by growth of KDP nanocrystals from saturated aqueous solution inside nanopores of amorphous alumina matrix Al ₂ O ₃ . The analysis of crystalline structure and surface morphology performed by XRD and AFM showed that Al ₂ O ₃ matrix is filled up with KDP nanocrystals of tetragonal phase in preferred crystallographic orientation (200). The nonlinear optical (NLO) response was studied by means of second harmonic generation (SHG) via Maker fringe technique using picosecond laser pulses at wavelength of 1064 nm. The obtained dependence of SHG intensity on laser polarization was explained by the anisotropy of macroscopic crystalline structure of KDP/Al ₂ O ₃ nanocomposite.

The nonlinear optical properties of conjugated rhenium containing azo-based iminopyridine complexes were studied by means of Maker fringe technique using 30 ps laser pulses at 1064 nm. The influence of UV irradiation of guest-host films on nonlinear optical response was investigated. The values of second and third order susceptibility before and after UV irradiation were extracted and analyzed. The nonlinear optical response of the rhenium containing complex which contain lateral dimethylamino group and forms a D-A π-conjugated structure was found to be more sensitive to UV treatment.