Перегляд за автором "Kurskoy, Yu.S."

Зараз показано 1 - 2 з 2
  • Зображення мініатюри
    Публікація
    Physical and Technological Principles of Processing Steel with UV Laser Radiation
    (СумДУ, 2023) Hnatenko, O. S.; Afanasieva, O. V.; Lalazarova, N. O.; Odarenko, E. N.; Sashkova, Y. V.; Ivanchenko, O. V.; Kurskoy, Yu.S.
    The main purpose of the article is to study the hardening of steel using non-standard wavelengths of laser radiation. The physical principles of the interaction of laser radiation with matter are also described. Experiments were carried out on hardening steel with a UV laser (wavelength 355 nm). The following experiments and a comparative analysis of volumetric hardening of steel with cooling in water, hardening with a YVO4 laser beam with (λ = 1.06 μm and hardening with a YVO4 laser beam with (λ = 0.355 μm. The studies were carried out on structural steel 45 and tool steels У12 and Р6M5. In the course of the research, new interesting scientific results were obtained: the study of the microstructure of U12 steel samples using an electron microscope showed that the martensite formed during quenching by UV radiation is more dispersed, as a result of which it can be concluded that such processing can lead to the production of surface nanostructures up to 100 nm in size. However, due to the low productivity and low power of UV radiation, the proposed steel hardening can be recommended for measuring and cutting tools.
  • Зображення мініатюри
    Публікація
    Precision Chaotic Laser Generation
    (2023) Kurskoy, Yu.S.; Hnatenko, O. S.
    The task of this work is development of precision chaotic laser generation principles. Its implementation will contribute to evolution of telecommunication systems based on the chaotic generators synchronization effect and other chaotic technology. The key problem for practical use of chaotic regimes is their strong dependence on fluctuations of initial conditions and weak external influences. This is a fundamental property of dynamic chaos. To solve the stated problem, we analyze the semiclassical laser equations for the stable, unstable, and chaotic generation modes. A modified equation for chaotic radiation is obtained. It is supplemented with fluctuations of the pumping parameters, laser components characteristics, and external factors. The equation is the basis for studying of laser dynamics under various initial conditions and for providing of precision chaotic generation.We propose a definition for precision chaotic laser generation. It is the generation of laser radiation, the dynamics of which is classified as chaotic with a given accuracy and is reproducible within the boundaries of the phase portrait. The choice of the phase portrait. as the object of study for precision, is due to the stability of chaotic solutions according to Lagrange. The precision is confirmed by comparing a phase portrait of the system with its reference portrait, obtained with controlled reference parameters of chaotic radiation. As the quantitative estimates of chaotic precision are chosen: the volume of attractor, Lyapunov exponents, and Hurst coefficient with allowable deviations. The precision of chaotic generation and control of chaotic dynamics are ensured by the precision of the pump parameters, by control and stabilization of the components and characteristics of laser, such as the size and dynamics of resonator, quality factor, radiation frequency, temperature, and others.