Персона: Евтихиев, Николай Николаевич
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Институт лазерных и плазменных технологий
Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.
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Николай Николаевич
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- ПубликацияТолько метаданныеEffect of burst mode modulation ultrashort pulse laser on the laser processing transparent dielectrics(2024) Murzakov, M. A.; Evtikhiev, N. N.; Grezev, N. V.; Shchekin, A. S.; Евтихиев, Николай Николаевич; Щекин, Александр Сергеевич
- ПубликацияТолько метаданныеIterative synthesis of binary inline Fresnel holograms for high-quality reconstruction in divergent beams with DMD(2022) Cheremkhin, P. A.; Evtikhiev, N. N.; Krasnov, V. V.; Starikov, R. S.; Zlokazov, E. Y.; Черёмхин, Павел Аркадьевич; Евтихиев, Николай Николаевич; Стариков, Ростислав Сергеевич; Злоказов, Евгений Юрьевич© 2021 Elsevier LtdAim of this paper is formation of single focused diffraction order using binary amplitude modulation for digital micromirror device (DMD) applications. This can be achieved by using inline binary Fresnel holograms with divergent incident beam. However, extremely low reconstruction quality and diffraction efficiency of such holograms, synthesized by conventional means, prevent it. Here, we present new iterative method of synthesis of binary inline Fresnel holograms with much higher image reconstruction quality and diffraction efficiency compared to standard technique of hologram direct calculation. Synthesis procedure was carried out in two stages. The first stage of the new technique is based on Gerchberg-Saxton algorithm with two principal differences. First one is that synthesized diffractive optical element (DOE) is not a phase one, but an inline binary amplitude hologram. And second difference is that incident wavefront is spherical instead of a plane one. The second stage includes an application of the direct search with random trajectory method which greatly improves hologram characteristics by consequent processing of every pixel in it. The resulting binary inline Fresnel holograms in comparison to ones, synthesized using direct calculation method, have up to 11 times lower reconstruction error and up to 4 times higher diffraction efficiency. Results of optical reconstruction using DMD also demonstrate superiority of the new approach.
- ПубликацияТолько метаданныеA Tribute to Sergey Odinokov(2022) Odinokova, O. I.; Kolyuchkin, V. Y.; Solomashenko, A. B.; Shishova, M. V.; Zlokazov, E. Y.; Starikov, R. S.; Evtikhiev, N. N.; Злоказов, Евгений Юрьевич; Стариков, Ростислав Сергеевич; Евтихиев, Николай Николаевич
- ПубликацияТолько метаданные3D-CGH-Net: Customizable 3D-hologram generation via deep learning(2025) Rymov,D.A.; Svistunov,A.S.; Starikov,R.S.; Shifrina,A.V.; Rodin,V.G.; Evtikhiev,N.N.; Cheremkhin,P.A.; Рымов, Дмитрий Андреевич; Свистунов, Андрей Сергеевич; Стариков, Ростислав Сергеевич; Шифрина, Анна Владимировна; Родин, Владислав Геннадьевич; Евтихиев, Николай Николаевич; Черёмхин, Павел Аркадьевич
- ПубликацияТолько метаданныеEffect of physical parameters of laser radiation on the process of weld formation in transparent dielectrics(2023) Murzakov, M. A.; Evtikhiev, N. N.; Grezev, N. V.; Kataev, D. M.; Евтихиев, Николай Николаевич
- ПубликацияОткрытый доступOptical encryption of digital information in the scheme with spatially incoherent illumination based on micromirror light modulators(2020) Evtikhiev, N. N.; Krasnov, V. V.; Kuzmin, I. D.; Molodtsov, D. Y.; Rodin, V. G.; Starikov, R. S.; Евтихиев, Николай Николаевич; Родин, Владислав Геннадьевич; Стариков, Ростислав Сергеевич© 2020 The Authors. Published by Elsevier B.V.State of the art micromirror DMD spatial light modulators (SLM) offer unprecedented frame rate of up to 32000 frames per second. This, in conjunction with fast digital camera, makes it possible to create high speed optical encryption systems. Experimental setup for optical encryption under spatially incoherent illumination based on two DMD SLMs had been created. Input information is displayed by first SLM, encoding hologram-by second SLM. Results of optical experiment demonstrate successful encryption and decryption of digital information in the form of QR code image.
- ПубликацияТолько метаданныеInterpolation-Filtering Method for Image Improvement in Digital Holography(2024) Kozlov,A.V.; Cheremkhin,P.A.; Svistunov,A.S.; Rodin,V.G.; Starikov,R.S.; Evtikhiev,N.N.; Козлов, Александр Валерьевич; Черёмхин, Павел Аркадьевич; Свистунов, Андрей Сергеевич; Родин, Владислав Геннадьевич; Стариков, Ростислав Сергеевич; Евтихиев, Николай НиколаевичDigital holography is actively used for the characterization of objects and 3D-scenes, tracking changes in medium parameters, 3D shape reconstruction, detection of micro-object positions, etc. To obtain high-quality images of objects, it is often necessary to register a set of holograms or to select a noise suppression method for specific experimental conditions. In this paper, we propose a method to improve filtering in digital holography. The method requires a single hologram only. It utilizes interpolation upscaling of the reconstructed image size, filtering (e.g., median, BM3D, or NLM), and interpolation to the original image size. The method is validated on computer-generated and experimentally registered digital holograms. Interpolation methods coefficients and filter parameters were analyzed. The quality is improved in comparison with digital image filtering up to 1.4 times in speckle contrast on the registered holograms and up to 17% and 29% in SSIM and NSTD values on the computer-generated holograms. The proposed method is convenient in practice since its realization requires small changes of standard filters, improving the quality of the reconstructed image.
- ПубликацияТолько метаданныеAdaptive Digital Hologram Binarization Method Based on Local Thresholding, Block Division and Error Diffusion(2022) Cheremkhin, P. A.; Kurbatova, E. A.; Evtikhiev, N. N.; Krasnov, V. V.; Rodin, V. G.; Starikov, R. S.; Черёмхин, Павел Аркадьевич; Евтихиев, Николай Николаевич; Родин, Владислав Геннадьевич; Стариков, Ростислав Сергеевич© 2022 by the authors. Licensee MDPI, Basel, Switzerland.High-speed optical reconstruction of 3D-scenes can be achieved using digital holography with binary digital micromirror devices (DMD) or a ferroelectric spatial light modulator (fSLM). There are many algorithms for binarizing digital holograms. The most common are methods based on global and local thresholding and error diffusion techniques. In addition, hologram binarization is used in optical encryption, data compression, beam shaping, 3D-displays, nanofabrication, materials characterization, etc. This paper proposes an adaptive binarization method based on a combination of local threshold processing, hologram division into blocks, and error diffusion procedure (the LDE method). The method is applied for binarization of optically recorded and computer-generated digital holograms of flat objects and three-dimensional scenes. The quality of reconstructed images was compared with different methods of error diffusion and thresholding. Image reconstruction quality was up to 22% higher by various metrics than that one for standard binarization methods. The optical hologram reconstruction using DMD confirms the results of the numerical simulations.
- ПубликацияТолько метаданныеComparative analysis of off-axis digital hologram binarization by error diffusion(2021) Cheremkhin, P. A.; Kurbatova, E. A.; Evtikhiev, N. N.; Krasnov, V. V.; Rodin, V. G.; Starikov, R. S.; Черёмхин, Павел Аркадьевич; Евтихиев, Николай Николаевич; Родин, Владислав Геннадьевич; Стариков, Ростислав СергеевичA digital micromirror device (DMD) provides 2D- and 3D-scene reconstruction by displaying diffractive and holographic optical elements. The highest frame rates (tens of thousands of Hz) can be achieved if the displayed optical elements are binarized. Except for DMD applications, hologram binarization is useful for display creation, image encryption, information compression and storage, fast 3D printing, etc. Error diffusion is one of the most qualitative implementations of hologram binarization. In this paper, three group's weighting matrices of error diffusion are analyzed: 16 standard, eight dot and six diagonal matrices. Thus, 30 error diffusion methods were used for optically recorded off-axis digital hologram binarization. The quality of the image reconstruction from the binarized holograms was compared. Direct applications of error diffusion with large weighting matrices and dot diffusion provide the highest reconstruction quality. Seven metrics were used as the error diffusion threshold. Twelve bypass directions of error diffusion were analyzed. In addition, the joint application of Otsu threshold and complex bypass directions allows us to improve the quality of hologram binarization by 15%.
- ПубликацияОткрытый доступSpeckle Noise Reduction in Digital Holography by 3D Adaptive Filtering(2025) Kerov, A. A.; Kozlov, A. V.; Cheremkhin ,P. A.; Shifrina, A. V.; Starikov, R. S.; Zlokazov, E. Y.; Petrova, E. K.; Nebavskiy, V. A.; Evtikhiev, N. N.; Керов, Андрей Алексеевич; Козлов, Александр Валерьевич; Черёмхин, Павел Аркадьевич; Шифрина, Анна Владимировна; Стариков, Ростислав Сергеевич; Злоказов, Евгений Юрьевич; Петрова, Елизавета Кирилловна; Небавский, Всеволод Алексеевич; Евтихиев, Николай Николаевич