Кафедра фізичних основ електронної техніки (ФОЕТ)

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1,55 mkm fiber laser with electronic controlled mode-locking
(CAOL, 2019) Hnatenko, O. S.; Neofitnyy, M. V.; Machekhin, Yu. P.; Zarytskyi, V. I.; Zhdanova, Yu. V.
A projection of an erbium-doped active-fiber laser is offered in this research paper. Mode synchronization method - the nonlinear evolution of mode polarization, is used to ensure the duration of femtosecond pulses. The basis of this method uses liquid crystal controllers polarization, which is controlled by an electrical signal. The proposed scheme and method for obtaining ultrashort pulses are free from the unstable operation of the laser.
A human as a research object for metrology of nonlinear dynamic systems
(2017) Machekhin, Yu. P.; Kurskoy, Yu. S.; Prisich, E. Yu.
The article presents the results of practical using of the approaches and tools of Metrology of nonlinear dynamic systems (Nonlinear Metrology). They were used for measurement and analysis of dynamic variables of a human body with a regular physical activity. As the analysis tools the intervals of dynamic variables values, measurement portrait, fractal dimension and Shannon entropy are used. The analysis of measurements results demonstrates that the dynamics of measured value is close to deterministic way. This is a characteristic trait of an open system with a self-organization function. The study results can be used for development of athletes training programs.
Airy Pulse Transformation by an Accelerated Medium Boundary
(CAOL, 2019) Gnatenko, A. S.; Zhyla, O. V.; Nerukh, A. G.
In the statement of a problem with a moving boundary there is one more idealization, namely, movement stationarity assuming that the movement has begun at infinite past time. Abandoning this idealization, by considering a movement that begins at a finite moment of time, leads to the appearance of new peculiarities in the wave transformation on a moving boundary. In this paper such peculiarities are considered with an abrupt uniform movement of a boundary beginning at zero moment of time, as well as with a smooth "turning on" of a boundary movement according to a relativistic uniformly accelerated law. In the latter approach the continuity of a boundary velocity change allows the development of the evolution of the wave transformation process to be traced.
Application of Supercontinuum in Optical Gyroscopy
(Sumy State University, 2023) Kurskoy, Yu. S.; Hnatenko, O. S.; Afanasieva, O. V.
Робота присвячена вивченню проблеми використання лазерного випромінювання в режимі суперконтинууму у волоконно-оптичних гіроскопах. Для досягнення поставленої мети в роботі вирішувалися наступні завдання: описано фізику процесу вимірювання кутової швидкості об'єкта на основі ефекту Саньяка; проаналізовано фактори, що впливають на роздільну здатність гіроскопа. Ці фактори включають частковий шум, неминучий шум і шум через зворотне розсіювання у волокні, який можна мінімізувати за допомогою фотонно-кристалічних волокон і широкосмугового джерела випромінювання. В якості такого джерела пропонується використовувати оптичний суперконтинуум (оптичну гребінку). Завдяки надширокому спектру випромінювання, точності відтворення частоти, високій стабільності випромінювання та фемтосекундній тривалості імпульсу суперконтинуум вважається перспективним джерелом випромінювання в гіперспектральній спектроскопії та зображенні, томографії та інтерферометрії білого світла з низькою когерентністю. Проведено аналіз можливості використання оптичної гребінки в оптичній гіроскопії. Проведено математичне моделювання впливу характеристик оптичного волокна та параметрів суперконтинууму на чутливість волоконного гіроскопа. Результати роботи свідчать про перспективність подальших досліджень зі створення фотонно-кристалічного волоконно-оптичного гіроскопа з використанням лазерного випромінювання суперконтинууму. The work is devoted to the study of the problem of using laser radiation in the supercontinuum mode in fiber optical gyroscopes. To achieve this goal, the following tasks were solved in the work. The physics of the process of measuring the angular velocity of an object based on the Sagnac effect is described. The factors influencing the resolution of the gyroscope are analyzed. These factors include fractional noise, unavoidable noise, and noise due to backscatter in the fiber, which can be minimized by using photonic crystal fibers and a broadband radiation source. It is proposed to use an optical supercontinuum (optical comb) as such a source. Thanks to its ultra-wide radiation spectrum, precision frequency reproduction accuracy, high radiation stability and femtosecond pulse duration, supercontinuum is considered as a promising radiation source in ranging, hyperspectral spectroscopy and imaging, tomography, and low-coherence white light interferometry. In the work of Lpischan, the physics of the supercontinuum generation process, its main characteristics. An analysis of the possibility of using an optical comb in optical gyroscopy has been carried out. Mathematical modeling of the influence of optical fiber characteristics and supercontinuum parameters on the sensitivity of a fiber gyroscope was carried out. The results of the work indicate the promise of further research on the creation of a photonic crystal fiber-optic gyroscope using supercontinuum laser radiation.
Bragg reflection and transmission of light by one-dimensional gyrotropic magnetophotonic crystal
(IEEE, 2017) Shmat'ko, A. A.; Mizernik, V. N.; Odarenko, E. N.; Rokhmanova, T. N.
Reflection and transmission coefficients for onedimensional magnetophotonic crystal with a bilayer unit cell are obtained in analytical form. The bilayer consists of arbitrary gyrotropic media. Analytical dispersion equation for gyrotropic multilayer periodic structure is obtained. Different regimes of bulk and surface wave’s propagation in structure layers are investigated. System parameters values that correspond to both total reflection and total transmission by gyrotropic Bragg structure are found. The possibility of band structure controlling with an external magnetic field is shown.
Calculation of the Stability of the Fiber Ring Laser with Liquid Crystal Polarization Controllers
(Sumy State University, 2018) Hnatenko, O. S.; Obozna, V. P.
To date, with the ultra-short pulse lasers are used in many areas of science and technology, including information technology. The main task of creating such lasers is to provide output radiation with the shortest pulse duration. The shortest duration pulses achieved in fiber ring lasers with nonlinear rotating polarization modes, namely 20 fs. But in such lasers, there are a number of problems: stability of operation and tuning of the mode locking. This is due to the tuning of the mode-locked by rotating the wave plates in space manually.
Change of the emission spectrum of sulfur lamp when changing the properties of the electromagnetic field
(ХНУРЭ, 2011) Machekhin, Yu. P.; Frolova, T. I.; Shunkova, I. A.
The paper is devoted to researching the behavior of the emission spectrum of an electrodeless sulfur lamp when the parameters of the microwave field pumping a system are being changed. Some cases of changes in the magnitude and spatial position of the microwave field antinode are studied. The obtained results make it possible to control the output radiation of the lamp when parameters of the microwave field are changing and monitor the pumping energy on the basis of the emitted spectrum of the sulfur lamp.
Design and Optimal Parameters of a Small-sized Diode-Pumped Nd:YAG Laser Setup
(2023) Machekhin, Yu. P.; Herasymov, S. S.; Hnatenko, O. S.
Дана стаття присвячена моделюванню, проектуванню та подальшій розробці практичної установки малогабаритного твердотільного лазера з середовищем посилення Nd:YAG та діодною накачкою. Твердотільні лазери існують близько 50 років і зазнали як позитивних, так і негативних аспектів під час своєї еволюції. Тим не менш, вони завжди займали важливе місце в багатьох галузях промисловості, наукових дослідженнях і повсякденній діяльності. На сьогоднішній день, такі пристрої широко використовуються та розвиваються в локації, виробництві, медицині та військовій техніці. Тому розробка та оптимізація їх структури залишається актуальною та важливою проблемою. Виявлено основні параметри компонентів компактного Nd:YAG лазера з діодною накачкою, які можуть бути реалізовані в конструкції далекоміра. Основні результати роботи. Розроблено та промодельовано Nd:YAG лазер з габаритними розмірами 350 x 25 x 25 мм; розміри лазерної активної головки 110 x 25 x 25 мм. Діодна накачка являє собою матрицю з шести діодів потужністю 90 Вт кожен, які працюють в імпульсному режимі тривалістю 250 нс. Резонатор складається з двох дзеркал, з коефіцієнтом відбиття на виході від 0,66 до 0,74. Активний елемент має довжину 72 мм. З такими параметрами лазера перший гігантський імпульс після початку накачування був досягнутий за 59 мкс, вихідна енергія 25 мДж і ефективність лазерної системи 22 %. Додатково генерувалися наступні імпульси випромінювання з інтервалом часу 4 мкс. Отримані в роботі результати дозволяють створити твердотільний лазер з діодною накачкою з енергією випромінювання на виході до 25 мДж і компактними розмірами резонатора близько 80 x 25 x 25 мм. This paper is dedicated to the modeling, design, and consequent construction of the practical setup of the small-size solid-state laser with Nd:YAG gain medium and the diode pumping. Solid-state lasers have been in existence for around 50 years and have experienced both positive and negative aspects during their evolution. Nevertheless, they have always held an essential position in numerous industries, scientific endeavors, and everyday activities. Nowadays, such devices are widely used and developed in location, manufacturing, medicine, and of course in military. Hence, the development and optimization of their structure remain a pertinent and important issue. The research reveals the basic component parameters for a compact Nd:YAG laser with diode pump, which can be implemented in the construction of range-finder. The main results of the work. Nd:YAG laser with overall dimensions of 350 x 25 x 25 mm was developed and modeled; the dimensions of the laser active head are 110 x25 x 25 mm. Diode pumping is a matrix of six diodes with a power of 90 W each, which operate in a pulse mode with a duration of 250 ns. The resonator consists of two mirrors, with an output reflectance from 0.66 to 0.74. The active element is 72 mm long. With these laser parameters, the first giant pulse after the start of pumping was achieved at 59 µs, an output energy of 25 mJ, and a laser system efficiency of 22 %. Additionally, the following radiation pulses were generated with a time interval of 4 µs. The results obtained in this work make it possible to create a diode-pumped solid-state laser with an output radiation energy of up to 25 mJ and have compact cavity dimensions of about 80 x 25 x 25 mm.
Design and study of a laser system for detecting optical devices
(ХНУРЭ, 2019) Hnatenko, O. S.; Machekhin, Yu. P.; Neofitnyi, M. V.; Gulak, S. V.
The development of a laser system for detecting optical devices is presented in this research work. The proposed laser system is based on two principles: first, fixing glare from optical devices; second, fixation with the help of a high-sensitive photodiode of low-intensity emission, which in turn complicates the operation of counteraction systems offered for the laser system.
Difraction of Electromagnetic Wave on Infinite Cylinder with Metamaterial Coating
(Institute of Radiophysics and Electronics National Academy of Sciences of Ukraine, 2014) Kostina, N. A.; Odarenko, E. N.
In this paper a task about interaction of plane monochromatic wave with a metallic or dielectric cylinder with a coating the material parameters of that can have both positive and negative values is considered. Implied, that the negative values of permittivity and permeability correspond to the negative refraction index of metamaterial. Basic attention was paid to development of the methods for the field distribution visualization inside the cylinder coating and in area of nearby space.
Dispersion Properties of a One-dimensional Anisotropic Magnetophotonic Crystal with a Gyrotropic Layer
(IEEE, 2016) Shmat'ko, A. A.; Mizernik, V. N.; Odarenko, E. N.; Yampol'skii, V. A.; Rokhmanova, T. N.; Galenko, A. Y.
In this work, we obtain the dispersion relation for magnetophotonic one-dimensional crystal with a gyrotropic plasma layer in the analytical form. The numerical analysis of the dispersion relation for waves in the crystal at different parameters of the effective permittivity of the plasma layer is carried out. We predict the propagation of bulk fast and slow waves in such structures. The transmission and forbidden bands in the dispersion diagram for the bulk waves are presented in the area for surface plasma waves.
Dispersion Properties of TM and TE Modes of Gyrotropic Magnetophotonic Crystals
(InTech, 2017) Shmat'ko, A. A.; Mizernik, V. N.; Odarenko, E. N.; Lysytsya, V. T.
This chapter discusses the propagation of TM and TE waves in the one-dimensional gyrotropic magnetophotonic crystals with ferrite and plasma-like layers. Elements of the transfer matrix are calculated in closed analytical form on the base of electrodynamic problem rigorous solution for arbitrary location of the gyrotropic elements on the structure period. Dispersion equation of the layered periodic structure with gyrotropic elements is obtained. Dispersion properties of the structure for TE and TM modes are analyzed for different configurations of magnetophotonic crystals (ferrite and plasma-like layers). Existence areas of transmission bands for surface and bulk waves are obtained. The effect of problem parameters on the dispersion properties of magnetophotonic crystals for TM and TE modes is investigated. Regimes of complete transmission of wave through limited magnetophotonic crystal are analyzed for bulk and surface waves.
Dwdm Communication Systems Based On Multifrequency Laser Radiation
(ХНУРЭ, 2013) Machekhin, Yu. P.; Voznuk, E. V.
The main limitation in current DWDM systems is the number of physical channels through which information is transmitted. “Physical channel”, in this case, means the optical frequency which, when modulated, allows the transfer of information. The current limitations of such systems are due to the use of laser sources and frequencies that are not stable and may arbitrarily vary within a certain range. Such systems require the frequency separation between channels to be set large enough so that the frequency of adjacent channels will not overlap. As a result, the possibility of increasing the volume and speed of data transfer through existing fiber optic systems is a topic constantly discussed in the literature [1]. For increasing the amount of information transmitted in DWDM systems is an obvious of increasing the number of physical channels in one single-mode fiber.
Dynamic System Chaotic Behaviour and Uncertanty Measurement
(2007) Machekhin, Yu. P.
The role of dynamical chaos as a mechanism of increasing measurement uncertainty in a nonlinear dynamic system is discussed. A mathematical model based on the logistic equation was used for investigation of the effect. It was found that the uncertainty measurement, which has abnormal distribution, is connected with dynamic chaos.
Effect of Electron Beam Thickness Upon the Performance of a Resonant Type-O Carcinotron with a Tapered Magnetostatic Field
(Begell House, 1999) Odarenko, E. N.; Shevchenko, N. G.
Theoretical analysis of O-type generator efficiency is performed for different thickness of sheet electron beam and spatial distributions of magnetic focusing field. Tilted focusing field and locally nonuniform one are considered. Effect of the electron beam thickness on the beam-wave interaction efficiency is investigated for regimes of maximum amplification and maximum power.
Effects of chaotic dynamic-system behavior on measurement uncertainty
(Springer, New York, 2008) Machekhin, Yu. P.
On an example of dynamic system, in which exist dynamical chaos, is shown, that uncertainty of measurement results of it parameters have anormal dispertion. For investigation this effect in nonlinear system, in paper was using mathematical model based on the logistic equation.
Electrodeless sulfur lamp on the basis of microwave excitation: estimation of spectral effectiveness of radiation for bio-objectsм
(ХНУРЭ, 2018) Frolova, T. I.
The paper considers a lighting system based on an electrodeless sulfur lamp with microwave excitation for bio-objects. As a result of the intensive development of new technologies in the field of lighting equipment (LED, HID lamps, and others) it is necessary to replace outdated lighting for a more energy-efficient one, by using new modern lamps of artificial radiation for biological objects (human, animals and plants). The parameters of optical radiation sources for different biological objects are different (for humans and some animals they are based on the sensitivity of the eye (photonic response curve), for plants – it is the photon flux density of photosynthetically active radiation (PAR) from 400 to 700 nm). High-pressure sodium lamps (HPSL) and metal halide lamps (MHL) are the most common among the artificial light sources used in greenhouses. However, at present, the most effective and promising are lighting systems based on LED lamps and the electrodeless sulfur lamp with microwave excitation. The latter is environmentally friendly (it does not contain mercury), with a high efficiency of PAR (72%) and durable (above 60,000 hrs.) Analysis of the spectral efficiency of radiation showed that the electrodeless sulfur lamp with microwave excitation has a high photosynthetic photon flux density (PPFD) (1440 μmol·s-1·m-2) in an optical range of 400-700 nm.
Emi sources from microwave electron device
(Published by Institute of Telecommunication, 1996) Nikitenko, A. N.; Vasyanovich, A. V.
Theoretical and experimental studies of spurious in crossed-field devices is described. Ions of residual gases in vacuum tubes are responsible for oscillations. These oscillations affect the electromagnetic oscillation in those tubes. Thus both the breadth and the concentration of output spectrum from crossed-field devices take place.The theoretical study was proved by experimental tests.
Expression of uncertainty in measurement of nonlinear dynamic variables
(ХНУРЭ, 2017) Machekhin, Yu. P.; Kurskoy, Yu. S.
We show a way for estimation and expression of uncertainty in measurement of nonlinear dynamic variables. The measurement results are represented by number of interval variables with not canonical distribution lows. Each interval is represented by the minimum and maximum values of dynamic variables with their measurement uncertainties. Within the intervals the dynamical variables are displayed by the histograms of measurement results values. The most and least probable values of dynamic variables with their uncertainties and probabilities are presented too. The measurement results are added with the fractal dimension, Shannon entropy and forecasting horizon time. The described set of measurement results is a measurement portrait
Extraordinary Reflection from Photonic Crystal with Metamaterials
(IEEE, 2016) Shmat'ko, A. A.; Kazanko, A. V.; Mizernik, V. N.; Odarenko, E. N.; Yampol'skii, V. A.; Rokhmanova, T. N.
We predict an extraordinary perfect reflection of a plane wave from a finite-thickness photonic crystal made of dielectrics and metamaterials. The physical nature of this phenomenon is revealed. We show that this complete reflection is related to a resonance of surface plasmon-polariton wave along the crystal thickness.