Mr. Alexander N. Nikitin Profile

Alexander N. Nikitin

Physicist-Project Manager at Sadovsky Institute of Geosphere Dynamics

SPIE Involvement:

Author

Publications (42)

Proceedings Article | 12 March 2024 Poster + Paper

Wide-aperture multichannel Shack-Hartmann sensor for multispectral wavefront measurements

Ilya Galaktionov, Alexander Nikitin, Julia Sheldakova, Vladimir Toporovsky, Alexis Kudryashov

Proceedings Volume 12871, 128710L (2024) https://doi.org/10.1117/12.3014349

KEYWORDS: Wavefront sensors, Adaptive optics, Wavefronts, Atmospheric propagation, Atmospheric optics, Sensors, Laser beam propagation, Laser radiation, Free space optics, Atmospheric particles

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Proceedings Article | 26 September 2023 Poster + Paper

Adaptive system with Zernike-based hill-climbing algorithm for super Gaussian and doughnut-like beam shaping

Ilya Galaktionov, Alexander Nikitin, Julia Sheldakova, Vladimir Toporovsky, Alexander Laskin, Alexis Kudryashov

Proceedings Volume 12667, 126670J (2023) https://doi.org/10.1117/12.2676756

KEYWORDS: Adaptive optics, Wavefront sensors, Spatial light modulators, Wavefronts, Sensors, Light scattering, Beam shaping, Scattering media, Phase distribution, Laser scattering

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Proceedings Article | 26 September 2023 Poster + Paper

Software and hardware implementation of the algorithm for 2-mirrors automatic laser beam alignment system

Ilya Galaktionov, Vladimir Toporovsky, Alexander Nikitin, Alexey Rukosuev, Alex Alexandrov, Julia Sheldakova, Alexander Laskin, Alexis Kudryashov

Proceedings Volume 12667, 126670I (2023) https://doi.org/10.1117/12.2676742

KEYWORDS: Near field, Automatic alignment, Wavefront sensors, Control systems, Laser systems engineering, Wavefronts, Sensors, Mirrors, Algorithm development, Reflection

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Proceedings Article | 3 October 2022 Presentation + Paper

Phase-only spatial light modulator for focusing a moderately scattered visible range laser beam

Ilya Galaktionov, Julia Sheldakova, Alexander Nikitin, Vladimir Toporovsky, Alexis Kudryashov

Proceedings Volume 12218, 1221808 (2022) https://doi.org/10.1117/12.2631997

KEYWORDS: Scattering, Light scattering, Laser scattering, Spatial light modulators, Wavefronts, Adaptive optics, Monte Carlo methods, Sensors, Refractive index

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Proceedings Article | 4 March 2022 Poster + Presentation + Paper

The method of designing an optical-electronic imaging system for correcting the parameters of the wavefront of laser radiation transmitted through a turbulent atmosphere

V. Toporovsky, P. Lyuy, D. Denisov, A. Zolotukhina, A. Nikitin, A. Kudryashov

Proceedings Volume 11987, 119870N (2022) https://doi.org/10.1117/12.2616105

KEYWORDS: Atmospheric optics, Optical design, Wavefronts, Turbulence, Refractive index, Imaging systems, Wavefront sensors, Atmospheric modeling, Adaptive optics, Image analysis

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Proceedings Article | 4 March 2022 Presentation + Paper

Shack-Hartmann sensor with B-spline approximation technique

Ilya Galaktionov, Alexander Nikitin, Julia Sheldakova, Alexis Kudryashov

Proceedings Volume 11987, 119870K (2022) https://doi.org/10.1117/12.2614658

KEYWORDS: Wavefronts, Wavefront sensors, Sensors, Zernike polynomials, Monochromatic aberrations, Wave propagation, Reconstruction algorithms

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Proceedings Article | 4 March 2022 Poster + Presentation + Paper

Statistical analysis of a wavefront distorted by laboratory turbulence in terms of Zernike polynomials

Julia Sheldakova, Vadim Belousov, Alexander Nikitin, Vladimir Toporovsky, Alexey Rukosuev, Alexis Kudryashov

Proceedings Volume 11987, 119870L (2022) https://doi.org/10.1117/12.2614533

KEYWORDS: Zernike polynomials, Turbulence, Statistical analysis, Wavefronts, Monochromatic aberrations, Wavefront sensors, Adaptive optics, Microlens array, Field programmable gate arrays, Mirrors

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Proceedings Article | 4 March 2022 Presentation + Paper

Wide-aperture deformable mirror for correcting and improving focusing of multi-petawatt Ti:Sa laser beam

Vladimir Toporovsky, Vadim Samarkin, Alexis Kudryashov, Alexander Alexandrov, Ilya Galaktionov, Alexander Nikitin, Alexey Rukosuev, Julia Sheldakova

Proceedings Volume 11987, 119870F (2022) https://doi.org/10.1117/12.2614522

KEYWORDS: Mirrors, Electrodes, Deformable mirrors, Wavefronts, Distortion, Optical amplifiers, Zernike polynomials, Wavefront sensors, Phase shifts, Optical components

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Proceedings Article | 4 March 2022 Presentation + Paper

FPGA based laser beam stabilization system

Julia Sheldakova, Ilya Galaktionov, Alexander Nikitin, Alexander Alexandrov, Alexis Kudryashov, Vadim Belousov, Alexey Rukosuev

Proceedings Volume 11987, 119870C (2022) https://doi.org/10.1117/12.2614525

KEYWORDS: Field programmable gate arrays, Mirrors, Photodiodes, Data communications, Zernike polynomials, Wavefronts, Laser systems engineering, Turbulence, Data conversion, Wavefront sensors

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Proceedings Article | 4 March 2022 Presentation + Paper

Calibration of a Shack-Hartmann wavefront sensor using spherical wavefronts from a point source

Alexander Nikitin, Ilya Galaktionov, Julia Sheldakova, Alexis Kudryashov, Dmitrii Denisov, Anastasiya Zolotukhina

Proceedings Volume 11987, 119870J (2022) https://doi.org/10.1117/12.2615161

KEYWORDS: Wavefronts, Sensors, Calibration, Spherical lenses, Wavefront sensors, Microlens, Cameras, Digital cameras, Distance measurement, Sensor calibration

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Proceedings Article | 16 December 2021 Paper

Laser beam focusing through a moderately scattering medium using LCOS-SLM

Ilya Galaktionov, Alexander Nikitin, Julia Sheldakova, Alexis Kudryashov

Proceedings Volume 11916, 119161L (2021) https://doi.org/10.1117/12.2605028

KEYWORDS: Scattering, Light scattering, Spatial light modulators, Wavefronts, Zernike polynomials, Refractive index

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Proceedings Article | 16 December 2021 Paper

Analysis of laboratory turbulence by spectral methods

Alexey Rukosuev, Vadim Belousov, Alexander Nikitin, Julia Sheldakova, Alexis Kudryashov

Proceedings Volume 11916, 119161H (2021) https://doi.org/10.1117/12.2603463

KEYWORDS: Wavefronts, Turbulence, Zernike polynomials, Mirrors, Wavefront sensors, Wavefront aberrations, Fourier transforms, Field programmable gate arrays

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Proceedings Article | 1 August 2021 Poster + Paper

B-spline approximation of a wavefront measured by Shack-Hartmann sensor

Ilya Galaktionov, Alexander Nikitin, Julia Sheldakova, Alexis Kudryashov

Proceedings Volume 11818, 118180N (2021) https://doi.org/10.1117/12.2598249

KEYWORDS: Wavefronts, Wavefront sensors, Zernike polynomials, Optical testing, Shape analysis, Reconstruction algorithms

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Proceedings Article | 5 March 2021 Presentation + Paper

Wavefront correction of laser beam distorted by fan heater turbulence using an adaptive optical system with a frequency of 2000 Hz

A. Rukosuev, V. Belousov, A. Nikitin, Yu. Sheldakova, A. Kudryashov, V. Bogachev, M. Volkov, S. Garanin, F. Starikov

Proceedings Volume 11678, 116780P (2021) https://doi.org/10.1117/12.2578143

KEYWORDS: Wavefronts, Turbulence, Data modeling, Wavefront distortions, Optical components, Mirrors, Field programmable gate arrays, Control systems

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Proceedings Article | 5 March 2021 Presentation + Paper

Focusing laser beam through pinhole using high-resolution stacked-actuator deformable mirror

Alexander Nikitin, Ilya Galaktionov, Julia Sheldakova, Alexis Kudryashov, Vadim Samarkin, Alexey Rukosuev, Vladimir Toporovsky

Proceedings Volume 11672, 116720W (2021) https://doi.org/10.1117/12.2578116

KEYWORDS: Deformable mirrors, Mirrors, Laser energy, Energy efficiency

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Proceedings Article | 12 November 2020 Paper

Comparison of efficiency of bimorph mirror and spatial light modulator for laser beam focusing through a moderately scattering medium

Ilya Galaktionov, Julia Sheldakova, Alexander Nikitin, Alexis Kudryashov

Proceedings Volume 11560, 115602A (2020) https://doi.org/10.1117/12.2575723

KEYWORDS: Mirrors, Scattering, Laser scattering, Light scattering, Distortion, CCD cameras, Spatial light modulators, Deformable mirrors, Electrodes, Wavefront sensors

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Proceedings Article | 12 November 2020 Paper

Correction of dynamic phase turbulent aberrations of a laser beam with a frequency of 1500 Hz

F. Starikov, M. Volkov, V. Bogachev, A. Khlebnikov, A. Rukosuev, A. Nikitin

Proceedings Volume 11560, 1156025 (2020) https://doi.org/10.1117/12.2575647

KEYWORDS: Turbulence, Wavefronts, Adaptive optics, Wavefront sensors, Mirrors, Field programmable gate arrays, Wavefront distortions, Diffraction, Deformable mirrors, Electrodes

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Proceedings Article | 12 November 2020 Paper

Adaptive optical system for correction of laser beam going through turbulent atmosphere

V. Belousov, I. Galaktionov, A. Kudryashov, A. Nikitin, O. Otrubyannikova, A. Rukosuev, V. Samarkin, I. Sivertceva, Ju. Sheldakova

Proceedings Volume 11560, 1156026 (2020) https://doi.org/10.1117/12.2575650

KEYWORDS: Wavefronts, Adaptive optics, Field programmable gate arrays, Mirrors, Atmospheric optics, Wavefront sensors, Wavefront distortions, Deformable mirrors, Optical calibration, Atmospheric corrections

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Proceedings Article | 18 September 2020 Presentation + Paper

Dynamic correction of the laser beam distortion by 2000 Hz FPGA-based adaptive optical system

A. Nikitin, F. Starikov, M. Volkov, V. Bogachev, A. Khlebnikov, A. Rukosuev

Proceedings Volume 11506, 1150607 (2020) https://doi.org/10.1117/12.2569338

KEYWORDS: Distortion, Earth's atmosphere, Atmospheric turbulence, Wavefronts, Field programmable gate arrays, Computing systems, Atmospheric modeling, Atmospheric optics, Control systems

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Proceedings Article | 14 September 2020 Presentation + Paper

Flat-top beam formation with miniature bimorph deformable mirror

Julia Sheldakova, Vladimir Toporovsky, Ilya Galaktionov, Alexander Nikitin, Alexey Rukosuev, Vadim Samarkin, Alexis Kudryashov

Proceedings Volume 11486, 114860E (2020) https://doi.org/10.1117/12.2569387

KEYWORDS: Deformable mirrors, Electrodes, Mirrors

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Proceedings Article | 14 September 2020 Presentation + Paper

FPGA-based 2 kHz closed-loop adaptive optical system with stacked actuator deformable mirror

J. Sheldakova, A. Rukosuev, V. Belousov, I. Galaktionov, A. Nikitin, V. Samarkin, A. Kudryashov

Proceedings Volume 11508, 115080K (2020) https://doi.org/10.1117/12.2569315

KEYWORDS: Actuators, Deformable mirrors, Earth's atmosphere, Turbulence, Wavefronts, Satellite communications, Satellites, Optical communications, Computing systems, Human-machine interfaces

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Proceedings Article | 20 August 2020 Presentation + Paper

A method for reconstructing the equation of the aspherical surface of mirrors in an explicit form using a device with a wavefront sensor

Alexey Sakharov, Nikolay Baryshnikov, Valery Karasik, Julia Sheldakova, Alexis Kudryashov, Alexander Nikitin

Proceedings Volume 11487, 114870B (2020) https://doi.org/10.1117/12.2569339

KEYWORDS: Wavefronts, Mirrors, Optical spheres, Wavefront sensors, Aspheric lenses, Error analysis, Sensors, Optics manufacturing, Manufacturing

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Proceedings Article | 2 March 2020 Presentation + Paper

Focusing laser beam through pinhole using stacked-actuator deformable mirror

Alexander Nikitin, Ilya Galaktionov, Julia Sheldakova, Alexis Kudryashov, Vadim Samarkin, Alexey Rukosuev, Vladimir Toporovsky

Proceedings Volume 11266, 112661B (2020) https://doi.org/10.1117/12.2548327

KEYWORDS: Deformable mirrors, Mirrors, Electrodes, Photodiodes, Diffraction, Wavefronts, Adaptive optics, Collimators, Zemax, Wavefront sensors

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Proceedings Article | 2 March 2020 Paper

Miniature bimorph deformable mirror for laser beam shaping

Julia Sheldakova, Ilya Galaktionov, Alexander Nikitin, Alexey Rukosuev, Vadim Samarkin, Vladimir Toporovsky, Alexis Kudryashov

Proceedings Volume 11266, 112661L (2020) https://doi.org/10.1117/12.2548292

KEYWORDS: Mirrors, Deformable mirrors, Laser engraving, Laser applications, Adaptive optics, Beam shaping, Wavefronts, Manufacturing, Cameras

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Proceedings Article | 2 March 2020 Paper

1.5 kHz adaptive optical system for free-space communication tasks

Alexey Rukosuev, Vadim Belousov, Ilya Galaktionov, Alexis Kudryashov, Alexander Nikitin, Vadim Samarkin, Julia Sheldakova

Proceedings Volume 11272, 112721G (2020) https://doi.org/10.1117/12.2548337

KEYWORDS: Field programmable gate arrays, Adaptive optics, Wavefronts, Cameras, Interfaces, Turbulence, Mirrors, Wavefront sensors, Telecommunications, Wavefront distortions

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Proceedings Article | 9 September 2019 Presentation + Paper

Adaptive optics for laser-beam focusing through the pinhole

Alexis Kudryashov, Alexander Nikitin, Ilya Galaktionov, Julia Sheldakova, Vadim Samarkin, Alexey Rukosuev

Proceedings Volume 11107, 111070F (2019) https://doi.org/10.1117/12.2534008

KEYWORDS: Adaptive optics, Deformable mirrors

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Proceedings Article | 6 September 2019 Presentation + Paper

Laser beam focusing through the scattering medium using bimorph deformable mirror and spatial light modulator

Ilya Galaktionov, Alexis Kudryashov, Julia Sheldakova, Alexander Nikitin

Proceedings Volume 11135, 111350B (2019) https://doi.org/10.1117/12.2533985

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Proceedings Article | 21 March 2019 Presentation + Paper

Focusing laser beam through pinhole using bimorph deformable mirror

Alexander Nikitin, Ilya Galaktionov, Julia Sheldakova , Alexis Kudryashov, Vadim Samarkin, Alexey Rukosuev

Proceedings Volume 10904, 109041I (2019) https://doi.org/10.1117/12.2510134

KEYWORDS: Deformable mirrors, Mirrors, Electrodes, Photodiodes, Diffraction, Wavefronts, Adaptive optics, Collimators, Zemax, Wavefront sensors

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Proceedings Article | 21 March 2019 Presentation + Paper

Stacked-actuators deformable mirror vs bimorph mirror for laser beam shaping

Julia Sheldakova, Ilya Galaktionov, Alexander Nikitin, Alexey Rukosuev, Vladimir Toporovsky, Alexis Kudryashov, Vadim Samarkin

Proceedings Volume 10904, 109041K (2019) https://doi.org/10.1117/12.2509521

KEYWORDS: Mirrors, Deformable mirrors, Electrodes, Actuators, Wavefront sensors, Wavefronts, Sensors, Beam shaping, Genetic algorithms, Adaptive optics

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Proceedings Article | 7 March 2019 Presentation + Paper

Absolute calibration of a Shack-Hartmann wavefront sensor for measurements of wavefronts

Alexander Nikitin, Ilya Galaktionov, Julia Sheldakova, Alexis Kudryashov, Nikolay Baryshnikov, Dmitrii Denisov, Valerii Karasik, Alexey Sakharov

Proceedings Volume 10925, 109250K (2019) https://doi.org/10.1117/12.2510047

KEYWORDS: Wavefronts, Sensors, Calibration, Cameras, Microlens, Wavefront sensors, Spherical lenses, Manufacturing, Light sources, Distance measurement

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Proceedings Article | 20 February 2019 Paper

Laser beam focusing through the dense multiple scattering suspension using bimorph mirror

Ilya Galaktionov, Alexis Kudryashov, Julia Sheldakova, Alexander Nikitin

Proceedings Volume 10886, 1088619 (2019) https://doi.org/10.1117/12.2509621

KEYWORDS: Mirrors, Sensors, Wavefront sensors, Scattering, Light scattering, Laser scattering, Electrodes, Deformable mirrors, CCD cameras

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Proceedings Article | 18 September 2018 Presentation + Paper

Laser beam focusing through the scattering medium-low order aberration correction approach

Ilia Galaktionov, Alexander Nikitin, Vadim Samarkin, Julia Sheldakova, Alexis Kudryashov

Proceedings Volume 10772, 107720W (2018) https://doi.org/10.1117/12.2324275

KEYWORDS: Distortion, Scattering, Mirrors, Laser scattering, Electrodes, Sensors, Light scattering, Wavefront sensors, Deformable mirrors, CCD cameras

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Proceedings Article | 14 September 2018 Presentation + Paper

LC phase modulator vs. deformable mirror for laser beam shaping: What is better?

Julia Sheldakova, Ilya Galaktionov, Alexander Nikitin, Alexey Rukosuev, Alexis Kudryashov

Proceedings Volume 10744, 107440S (2018) https://doi.org/10.1117/12.2324260

KEYWORDS: Modulators, Deformable mirrors, Wavefronts, Beam shaping, CCD cameras, Wavefront sensors, Image processing

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Proceedings Article | 24 April 2018 Paper

Adaptive optical system for laser beam formation

Julia Sheldakova, Alexis Kudryashov, Alexey Rukosuev, Alexander Nikitin, Ilya Galaktionov, Vladimir Toporovsky

Proceedings Volume 10712, 107121A (2018) https://doi.org/10.1117/12.2318986

KEYWORDS: Wavefront sensors, Deformable mirrors, Mirrors, Wavefronts, Electrodes, Sensors, Beam shaping, Phase measurement, CCD cameras, CCD image sensors

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Proceedings Article | 22 February 2018 Presentation + Paper

Comparative analysis of methods and optical-electronic equipment to control the form parameters of spherical mirrors

Alexander Nikitin, Nikolay Baryshnikov, Dmitrii Denisov, Valerii Karasik, Alexey Sakharov, Pavel Romanov, Julia Sheldakova, Alexis Kudryashov

Proceedings Volume 10539, 105390Z (2018) https://doi.org/10.1117/12.2297078

KEYWORDS: Spherical lenses, Sensors, Wavefronts, Mirrors, Optical testing, Wavefront sensors, Interferometry, Interferometers, Cameras, Fizeau interferometers

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Proceedings Article | 16 February 2018 Presentation + Paper

Comparison of the efficiency of laser beam focusing through the scattering medium using 14- and 31-channel bimorph mirrors

Ilya Galaktionov, Alexis Kudryashov, Julia Sheldakova, Alexander Nikitin, Vadim Samarkin

Proceedings Volume 10518, 1051818 (2018) https://doi.org/10.1117/12.2297080

KEYWORDS: Distortion, Scattering, Laser scattering, Mirrors, Sensors, Electrodes, Wavefront sensors, Light scattering, Deformable mirrors, CCD cameras

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Proceedings Article | 16 February 2018 Presentation + Paper

Formation of the doughnut and Super-Gaussian intensity distribution by means of different types of wavefront correctors

Julia Sheldakova, Alexis Kudryashov, Ilya Galaktionov, Vadim Samarkin, Alexander Nikitin, Alexey Rukosuev

Proceedings Volume 10518, 105181E (2018) https://doi.org/10.1117/12.2297089

KEYWORDS: Deformable mirrors, Mirrors, Wavefronts, Modulators, Actuators, Wavefront sensors, Monochromatic aberrations, Electrodes, Beam shaping, Zernike polynomials

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Proceedings Article | 6 September 2017 Paper

Laser beam focusing through the atmosphere aerosol

Ilya Galaktionov, Alexis Kudryashov, Julia Sheldakova, Vadim Samarkin, Alexander Nikitin

Proceedings Volume 10410, 104100M (2017) https://doi.org/10.1117/12.2276180

KEYWORDS: Atmospheric optics, Atmospheric particles, Atmospheric propagation, Aerosols, Laser scattering, Scattering, Adaptive optics, Deformable mirrors, Laser beam propagation

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Proceedings Article | 21 February 2017 Paper

Laser beam focusing through the scattering medium by means of adaptive optics

Ilya Galaktionov, Alexis Kudryashov, Julia Sheldakova, Alexander Nikitin

Proceedings Volume 10073, 100731L (2017) https://doi.org/10.1117/12.2256447

KEYWORDS: Light scattering, Laser scattering, Scattering, Deformable mirrors, Wavefront sensors, Sensors, Laser beam propagation, Adaptive optics, Beam analyzers, Electrodes, CCD cameras, Mirrors, CCD image sensors, Information operations

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Proceedings Article | 20 February 2017 Presentation + Paper

The use of modified hill-climbing algorithm for laser beam focusing through the turbid medium

Ilya Galaktionov, Alexis Kudryashov, Julia Sheldakova, Alexander Nikitin

Proceedings Volume 10090, 100901K (2017) https://doi.org/10.1117/12.2257447

KEYWORDS: Mirrors, Laser scattering, Scattering, Wavefront sensors, Sensors, CCD cameras, CCD image sensors, Deformable mirrors, Electrodes, Actuators, Light scattering

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Proceedings Article | 16 March 2016 Paper

A device based on the Shack-Hartmann wave front sensor for testing wide aperture optics

Alexander Nikitin, Julia Sheldakova, Alexis Kudryashov, Gilles Borsoni, Dmitrii Denisov, Valerii Karasik, Alexey Sakharov

Proceedings Volume 9754, 97540K (2016) https://doi.org/10.1117/12.2219282

KEYWORDS: Sensors, Wavefronts, Wavefront sensors, Optical testing, Interferometry, Fizeau interferometers, Mirrors, Microlens, Interferometers, Cameras

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Proceedings Article | 6 April 2015 Paper

Hartmannometer versus Fizeau Interferometer: advantages and drawbacks

Alexander Nikitin, Julia Sheldakova, Alexis Kudryashov, Dmitrii Denisov, Valerii Karasik, Alexey Sakharov

Proceedings Volume 9369, 936905 (2015) https://doi.org/10.1117/12.2085263

KEYWORDS: Wavefronts, Fizeau interferometers, Sensors, Wavefront sensors, Photovoltaics, Detector arrays, Calibration, Optical testing, Optical components, Interferometers

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Showing 5 of 42 publications

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