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Information × Registration Number 0223U003525, 0122U200157 , R & D reports Title New possibilities of control of optical structures and processes by methods of photorefraction, biophotonics, femtosecond and singular optics popup.stage_title Head Vasnetsov Mykhailo V., Доктор фізико-математичних наук Registration Date 19-05-2023 Organization Institute of Physics of National Academy of Sciences of Ukraine popup.description2 The main direction of the conducted research was to establish the features of the formation of light-induced periodic surface structures (LIPSS) on the surface of solid bodies, which are formed by powerful pulsed laser radiation. Using femtosecond laser irradiation with a wavelength of 800 nm, as well as second (400 nm) and third (266 nm) laser harmonics, micro- and nano-structuring of the surface of n-doped silicon was achieved. The highest quality structuring of LIPSS was obtained on the surface of sapphire, which is transparent to the visible range of the spectrum. With the development and comprehensive application of laser treatment of various surfaces with femtosecond pulses, the characteristics of LIPSS treated sapphire orientation surfaces were investigated in this paper. The work also investigated the self-diffraction of two coherent light waves that record a holographic grating in thin films of azobenzene-containing molecular glass-forming materials. It has been established that the basis of grating recording is the Kerr optical nonlinearity associated with photoinduced mass transfer. The impact of light irradiation on the details of the photosynthesis process is considered, which is an urgent problem for establishing the spectrum of action of UV photons that initiate the production of previtamin D in human skin. The research analyzed the passage of a short pulse in a system of two transparent prisms with a gap between them, which forms a waveguide. The conditions for the appearance of the forerunning effect have been established. The formation of an anticipatory jet in the waveguide is shown. Product Description popup.authors Blonskyi Ivan Vasyliovych Vasnetsov Mikhail Viktorovich Hvozdovskyi Ihor Anatoliiovych Golub Pavlo Volodymyrovych Gulkov Mikhailo Yurievych Dmytruk Andrij Mykolajovych Kadan Viktor Mykolayovych Korenyuk Petro Ivanovych Mitryaev Oleksandr Oleksiyovych Odulov Sergii Georgiiovych Pasko Valerii Arkadiyovych Plutenko Dmitro O. Ponevchinskii Vladislav V. Skrypka Yaroslav Mykolayovych Terenetska Iryna Palladiivna Turchyn Oleksandr V Shumelyuk Olexandr Mykolayovych Shcherbin Kostiantyn Volodymyrovych popup.nrat_date 2023-05-19 Close