Перегляд за автором "Hnatenko, O. S."
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Публікація 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.Публікація 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.Публікація 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.Публікація 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.Публікація 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.Публікація Fiber Laser Based on Electronically Controlled Phase Plates(Sumy State University, 2021) Hnatenko, O. S.Досліджено фізичні принципи синхронізації мод в волоконних лазерах для вихідного випромінювання з тривалістю імпульсу фемтосекундного порядку. З проведеного аналізу можна зробити висновок, що найбільш ефективним методом створення кільцевого волоконного лазера з ультракороткими імпульсами є метод еволюції нелінійної поляризації, який характеризується простими налаштуваннями виходу на режим і його стійкістю. Проведено теоретичні та експериментальні дослідження рідкокристалічних комірок для управління поляризацією випромінювання лазера. Для нематичних плоских рідкокристалічних комірок існує напруга відсічення, яка становить 2,2-2,5 В для комірки, описаної в даній роботі. При вивченні взаємодії лазерного випромінювання з коміркою було виявлено, що кут орієнтації поляризації в просторі змінюється від 0 до 90° при прикладенні напруги від 2,2 до 10 В. При прикладенні напруги більше 10 В, комірка "насичується", і кут повороту поляризації змінюється дуже мало, при прикладенні напруги більше 10 В може відбутися електричний пробій рідкокристалічного шару. Проведено теоретичне моделювання синхронізації мод в кільцевому волоконному лазері. А саме, було вивчено формування вихідних лазерних імпульсів при різних положеннях хвильових пластин або подачі напруги на рідкокристалічну комірку. Теоретично лазер може генерувати як безперервному, так і квазіімпульсному режимі. Створено експериментальний зразок волоконного лазера з синхронізацією мод за допомого рідкокристалічних комірок, який має наступні параметри: тривалість імпульсу фемтосекундного порядку, довжина хвилі випромінювання 1550 нм. Ці параметри дають перевагу при використанні лазера для високошвидкісної передачі даних по оптоволоконних лініях зв'язку і квантової криптографії. The physical principles of mode locking in fiber lasers for output radiation with a pulse duration of the femtosecond order have been studied. From the analysis performed, it can be concluded that the most effective method for the development of a ring fiber laser with ultrashort pulses is the method of nonlinear polarization evolution, which is characterized by simple settings for reaching the regime and stable mode locking. Short pulse durations were obtained by means of this method. A theoretical and experimental study of an LC cell for controlling laser polarization has been carried out. For nematic planar LC cells, there is cut-off voltage, which is 2.2-2.5 V for the cell described in this work. When studying the interaction of laser radiation with the cell, it was found that the angle of polarization state in space changes from 0 to 90° when a voltage is applied from 2.2 to 10 V. When a voltage of more than 10 V is applied, the cell is “saturated” and the angle of polarization rotation changes very little, and when a voltage of more than 10 V is applied, an electrical breakdown of the LC layer may occur. A theoretical simulation of mode locking in a ring fiber laser has been carried out. Namely, the formation of output laser pulses at different positions of the wave plates or voltage supply to the liquid crystal cell has been studied. Theoretically, the laser has the ability to generate both continuous and quasi-pulse modes. An experimental prototype of a fiber laser with mode locking by liquid crystal cells has been developed, which has the following parameters: pulse duration of the femtosecond order, radiation wavelength of 1550 nm. These parameters give an advantage in the use of a laser for high-speed data transfer over fiber communication lines and quantum cryptography.Публікація Fiber-optic system for control of the orientation of objects in space(SPIE, 2023) Hnatenko, O. S.; Machekhin, Yu. P.; Bilichenko, V.; Zarytskyi, V.; Yaroslavskyy, Y.; Klimek, J.; Mussabekov, K.; Yeraliyeva, B.; Ormanbekova, A.This article illustrates a system for stabilizing objects in space based on integral fiber elements. The proposed system showed results commensurate with similar systems with a length of tens of kilometers of SMF-28 optical fiber, while using PANDA type optical fiber is only 200 m. In the work, a model of the system was developed and experimental studies of the response and angular velocity of the gyroscope were carried out.Публікація Fibre-Optic Temperature Sensor Using Bragg Structure(2023) Kukhtin, S. М.; Hnatenko, O. S.Волоконно-оптичні сенсори зарекомендували себе як інноваційна та універсальна технологія вимірювання різних фізичних величин, таких як температура. Окрім цього, особливі властивості оптичних волокон, у деяких випадках, роблять волоконно-оптичне зондування єдино прийнятним вибором зважаючи на умови експлуатації, точність, можливість дистанційної роботи. У цій статті нами представлено простий волоконно-оптичний сенсор температури, що використовує відбиваючий елемент Брегга як чутливий елемент. Основна перевага запропонованого підходу полягає у використанні широко доступних недорогих телекомунікаційних компонентів, таких як РЗЗ лазер як джерело світла та широко доступні компоненти волоконної оптики. Ще однією перевагою датчика є методика вимірювання, яка не потребує оптичного спектрометра, чи інших точних оптичних вимірювань, таких як інтерферометрія. Показано, що реалізуючи різні бреггівські структури для чутливого елемента, можна змінювати оптичний відгук, таким чином досягаючи необхідних характеристик сенсора. Розрахунки для сенсорної головки Брегга представлені як для датчика вузького діапазону, придатного для медичного використання, так і для датчика температури з широким діапазоном вимірювань ΔT ~ 200 °C. Також ця стаття містить короткий огляд широко використовуваних волоконно-оптичних методів вимірювання температури, їх переваги та застосування. Fiber-optic sensing has established itself as an innovative and versatile measurement technology for various physical parameters, such as temperature. Moreover, particular properties of optical fibers, in some cases, make fiber-optic sensing only suitable choice due to operation conditions, precision and accuracy, possibility of remote operation. In this paper we present the simple fiber optic temperature sensor system that utilizes reflective Bragg element as a sensing head. The main advantage of the proposed approach relies on the use of widely available low-cost telecommunication devices, such as a DFB laser as a light source and commonly used fiber optics components. Another advantage of the sensor is measurement technique that doesn’t require optical spectrometer or other precise optical measurements such as interferometry. It is shown that by implementing various Bragg structures for the sensing element it is possible to alter optical response thus achieving required characteristics of the sensor. Calculations for Bragg structures are presented for both narrow range sensor suitable for medical use and wide range temperature sensor with ΔT 200 °C. In addition, this paper provides brief review of commonly used fiberoptic temperature sensing techniques, their advantages and application.Публікація Formation of Laser Radiation Pulses for Encoding in Formation(Sumy State University, 2018) Obozna, V. P.; Hnatenko, O. S.The main purpose of this work is to study the characteristics of the sequence of output pulses and the distances between the peaks of the pulses of the output radiation of a ring fiber femtosecond laser with nonlinear evolution of mode polarization for encoding information on the phase of pulses. An example of coding information for the phase of pulses is figure 1, which shows the pulse sequence corresponding to the number 101010010100 in the binary system, which is 2708 in the decimal system.Публікація Investigation of the Generation of Droplet Lasers(Sumy State University, 2018) Sivni, V. B.; Hnatenko, O. S.In this paper, the geometric parameters of liquid resonators of the type of a whisperer gallery are investigated and calculated theoretically. Namely, the laser dye Rhodamine 6G in the form of a drop on the substrate is pumped at a wavelength of 532 nm and emits a wavelength of 580 nm. The paper investigates the change in the wavelength of the radiation with a change in the droplet size. And also calculated the maximum angles of adhesion of the drop to the substrate.Публікація Laser system for recording optics(CAOL, 2019) Semenets, V. V.; Neofitnyy, M. V.; Machekhin, Yu. P.; Hnatenko, O. S.; Zarytskyi, V. I.; Gulak, S. V.The development of a modern laser system for recording optics is presented in this research paper. Studying optical components for designing this system by various methods, by calculated methods and by a method of using modern modeling package Zemax, was conducted. The results of the calculations and simulation, which led to the preliminary design of the laser system of optics registration, coincide.Публікація New Technologies of Laser Hardening of Parts of Fuel Equipment(Sumy State University, 2023) Hnatenko, O. S.; Afanasieva, O. V.; Lalazarova, N. O.; Kurskoy, Yu. S.; Odarenko, E. N.; Sashkova, Y. V.; Ivanchenko, O. V.Laser thermal hardening of steel (laser hardening) consists in heating a section of the steel surface above the phase transition temperature by laser radiation, followed by rapid cooling due to heat removal. As a result of this treatment, martensite is formed – a saturated solid carbon solution in α-iron. For laser hardening, gas CO2 lasers, solid-state (mainly Nd:YAG) and fiber lasers with a power of 0.5 kW or more are most often used. Optical systems for deploying and scanning the beam allow you to harden large areas of the surface with maximum efficiency. Not all products need processing of significant areas. Measuring and cutting tools, parts of fuel equipment, pump injectors are subject to significant abrasive wear of individual small areas. Less powerful lasers can be used to process them. There are no results of using low power pulsed lasers (up to 20 W) for surface hardening of steel products. The purpose of this work is to determine the modes of surface hardening of parts and tools made of carbon and alloy steels using low power pulsed solid-state YAG lasers. For laser hardening, a solid-state YAG laser with a power of 5 W (diode pumping, radiation wavelength = 1.064 µm, pulsed mode) was used. The use of a nonlinear crystal made it possible to obtain UV radiation from λ = 0.355 µm (third harmonic). Processing with single pulses and multi-pulse processing with short pulses were investigated. Thermal hardening was carried out on carbon and alloy steels of various compositions: 20, 45, У12, Р6M5, Р9, ШХ15, structural and tool steels for the purpose. The possibility of hardening by UV radiation was evaluated on steels 20, 45, У12 and ЩХ15. The efficiency of laser thermal hardening was evaluated by measuring microhardness. For surface hardening of products, where partial melting of the surface is possible, low-power pulsed lasers can be used. Laser hardening by UV radiation is a promising direction for thermal hardening of steels without surface melting. Hardening with a low-power laser is expedient for hardening parts of fuel equipment.Публікація Optical system recognition via topological methods(SPIE, 2020) Kurskoy, Yu. S.; Hnatenko, O. S.; Machekhin, Yu. P.; Neofitnyi, M. V.; Zarytskyi, V. I.The aim of the paper is to create a topological model for the detection and recognition of hidden optical surveillance systems. The model is based on fractal insights about the structure of the optical signal and determination of the fractal dimension intensity distribution in a cross-sectional plane of the laser pulse reflected from the target. It is shown that the approximation of the fractal dimension value to unity is a prerequisite to the target classification as an optical surveillance device. In order to classify the type of an optical device along with the fractal dimension the group of the fractal characteristics, consisting of the type of fractal signatures, the type of spatial spectrum and the values of spatial frequency that characterize the signal structure must be developed.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.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.Публікація Precision Synchronization of Chaotic Optical Systems(CумДУ, 2021) Kurskoy, Yu. S.; Hnatenko, O. S.; Afanasieva, O. V.The ideas of this article develop the technologies for synchronization of chaotic information systems components and parameters. Such systems hide information by embedding data into a chaotic carrier signal. Precision chaotic synchronization requires the correct measurement and analysis of chaotic dynamic variables. A model for estimating the degree of synchronization of chaotic laser modes is proposed. The model is based on the principles and methods of nonlinear chaotic values measurement. It provides the measurement and analysis of chaotic variables, the formation of measurement portrait that represents the states and dynamics of the system, and completes the methods for estimating the chaos degree, radiation parameters stability, and degree of synchronization of dynamic variables. A scheme for studying and controlling the chaotic dynamics of pulsed lasers, which includes a laser, a pulsed energy meter, a spectrum analyzer, a pulse frequency measurement unit, and a system for control, synchronization and recording measurement results is proposed. The divergence criteria for the dynamic variables’ values, fractal dimensions, measurement phase? portraits are offered for evaluation of synchronization. The equation that connects the fractal dimension and system parameters stability is obtained. It can be used for control of chaotic information systems components and parameters dynamics.Публікація Quantum computing. Quantum information technologies as the basis for future learning platforms(ISMA University of Applied Science, Riga, Latvia, 2021) Hnatenko, O. S.This paper presents the place of quantum technologies in the modern information world. The technique of quantum computing is described. Also presented is a new model of a qubit based on a nanolaser with frequency stabilization, which emits at different wavelengths, which corresponds to its different states. Thus, the work proposes a scheme of a qubit, which underlies quantum technologies and quantum computers. Quantum computing is a thousand times faster than existing ones. In the future this technology will be able to solve problems that are beyond the power of modern computers, which means it will become the basis for learning and understanding the world more broadly.Публікація System for recognition of optical tools,based on fractal mathematic views(2021) Kurskoy, Yu. S.; Hnatenko, O. S.The aim of the paper is to create a fractal model for detection and recognition of optical systems. The model is based on fractal insights about the structure of the optical signal and determination of the fractal dimension intensity distribution in a cross-sectional plane of the laser pulse reflected from the target. It is shown that the approximation of the fractal di-mension value to unity is a prerequisite to the target classification as an optical surveillance device. In order to classify the type of an optical device along with the fractal dimension the group of the fractal characteristics, consisting of the type of fractal signatures, the type of spatial spectrum and the values of spatial frequency that characterize the signal structure must be developed.Публікація The impact of laser radiation on nanoparticles, which using in medical(Sumy State University, 2019) Obozna, V. P.; Hnatenko, O. S.This paper proposes a method of modified chemotherapy, which consists in the use of nanoparticles of porous silicon. These pores are filled with medicine for chemotherapy.Публікація The usage of lasers in military equipment. Part1.(LAP LAMBERT Academic Publishing, 2020) Hnatenko, O. S.; Semenets, V. V.; Neofitnyi, M. V.The monograph considers the possibility of using various types of lasers in optical systems for military applications: rangefinders, navigation systems, guidance and suppression systems, ABM defense and space-missile defense systems, as well as quantum data security systems. For better perception, the monograph highlights the following physical principles of lasers: gas, solid-state, free electron, and fiber. The monograph is intended for researchers, engineers and technicians engaged in research and development, manufacturing of laser devices for various purposes. It can also be useful for graduate students, students and cadets of the relevant specialties of higher educational institutions in the study of subjects related to laser and optoelectronic technology.