Dr. Svetlana L. Lachinova Profile

Dr. Svetlana L. Lachinova

Senior Scientist at Coherent Aerospace & Defense, Inc.

SPIE Involvement:

Conference Program Committee | Author

Publications (16)

Proceedings Article | 4 October 2024 Presentation

Impact of speckle-beacon size on wavefront sensing and adaptive optics control in volume turbulence

Svetlana Lachinova, Mikhail Vorontsov, Ernst Polnau

Proceedings Volume PC13149, PC131490A (2024) https://doi.org/10.1117/12.3027494

KEYWORDS: Adaptive optics, Wavefront sensors, Turbulence, Adaptive control, Control systems, Speckle, Detection and tracking algorithms, Wavefronts, Wavefront aberrations, Surface roughness

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Proceedings Article | 12 October 2023 Presentation

Atmospheric path characterization using wave-optics modeling and simulation software platform integrated with numerical weather prediction data

Svetlana Lachinova

Proceedings Volume 12693, 126931H (2023) https://doi.org/10.1117/12.2677138

KEYWORDS: Atmospheric modeling, Computer simulations, Modeling, Data modeling, Atmospheric optics, Atmospheric propagation, Atmospheric particles, Wave propagation, Visualization, Turbulence

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Proceedings Article | 19 September 2017 Presentation

GPU-enhanced computational platform for performance evaluation of atmospheric optical systems (Conference Presentation)

Svetlana Lachinova, Mathieu Aubailly, Morris Maynard, Mikhail Vorontsov, Mark Spencer

Proceedings Volume 10410, 104100T (2017) https://doi.org/10.1117/12.2277480

KEYWORDS: Imaging systems, Atmospheric optics, Adaptive optics, Wavefront sensors, Optical imaging, Numerical simulations, Parallel computing, Numerical analysis, Laser applications, Computer simulations

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SPIE Journal Paper | 13 May 2017

Comparative analysis of numerical simulation techniques for incoherent imaging of extended objects through atmospheric turbulence

Svetlana Lachinova, Mikhail Vorontsov, Grigorii Filimonov, Daniel LeMaster, Matthew Trippel

OE, Vol. 56, Issue 07, 071509, (May 2017) https://doi.org/10.1117/12.10.1117/1.OE.56.7.071509

KEYWORDS: Atmospheric turbulence, Numerical simulations, Monte Carlo methods, Estimation theory, Modulation transfer functions, Imaging systems, Light sources

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Proceedings Article | 20 September 2016 Presentation + Paper

Numerical techniques for analysis of joint impact of atmospheric turbulence and aerosol scattering effects on imaging systems

Vadim Dudorov, Mikhail Vorontsov, Svetlana Lachinova, Stephanie Cunningham

Proceedings Volume 9982, 99820D (2016) https://doi.org/10.1117/12.2239024

KEYWORDS: Atmospheric turbulence, Aerosols, Scattering, Laser scattering, Atmospheric propagation, Atmospheric modeling, Atmospheric particles, Visibility, Laser beam propagation, Backscatter

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Proceedings Article | 18 May 2016 Paper

Comparative analysis of numerical simulation techniques for incoherent imaging through atmospheric turbulence

Svetlana Lachinova, Mikhail Vorontsov, Daniel LeMaster, Matthew Trippel

Proceedings Volume 9846, 984605 (2016) https://doi.org/10.1117/12.2228615

KEYWORDS: Numerical simulations, Monte Carlo methods, Turbulence, Atmospheric turbulence, Computer simulations, Modulation transfer functions, Surface roughness, Imaging systems, Numerical simulations, Receivers, Atmospheric propagation

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Proceedings Article | 6 March 2014 Paper

Performance analysis of a coherent tiled fiber-array beam director with near-field phase locking and programmable control of tip/tilt and piston phases

Grigory Filimonov, Mikhail Vorontsov, Svetlana Lachinova

Proceedings Volume 8971, 897109 (2014) https://doi.org/10.1117/12.2044491

KEYWORDS: Wavefronts, Mode locking, Near field, Atmospheric turbulence, Atmospheric propagation, Laser beam propagation, Wave propagation, Atmospheric optics, Phase shifts, Fiber amplifiers

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Proceedings Article | 22 February 2011 Paper

Experimental study of phase locking of fiber collimators using internal beam-tail interference

Leonid Beresnev, Mikhail Vorontsov, Thomas Weyrauch, Gary Carhart, Svetlana Lachinova, Jiang Liu

Proceedings Volume 7914, 79142Z (2011) https://doi.org/10.1117/12.877300

KEYWORDS: Collimators, Mode locking, Beam splitters, Feedback control, Feedback loops, Wavefronts, Diffractive optical elements, Optical components, Photodiodes, Gaussian beams

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Proceedings Article | 10 February 2011 Paper

Wavefront sensing and adaptive control in phased array of fiber collimators

Svetlana Lachinova, Mikhail Vorontsov

Proceedings Volume 7924, 79240F (2011) https://doi.org/10.1117/12.875943

KEYWORDS: Wavefronts, Wavefront sensors, Collimators, Mode locking, Adaptive optics, Wavefront reconstruction, Atmospheric propagation, Reconstruction algorithms, Adaptive control, Atmospheric turbulence

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A new wavefront control approach for mitigation of atmospheric turbulence-induced wavefront phase aberrations in coherent fiber-array-based laser beam projection systems is introduced and analyzed. This approach is based on integration of wavefront sensing capabilities directly into the fiber-array transmitter aperture. In the coherent fiber array considered, we assume that each fiber collimator (subaperture) of the array is capable of precompensation of local (onsubaperture) wavefront phase tip and tilt aberrations using controllable rapid displacement of the tip of the delivery fiber at the collimating lens focal plane. In the technique proposed, this tip and tilt phase aberration control is based on maximization of the optical power received through the same fiber collimator using the stochastic parallel gradient descent (SPGD) technique. The coordinates of the fiber tip after the local tip and tilt aberrations are mitigated correspond to the coordinates of the focal-spot centroid of the optical wave backscattered off the target. Similar to a conventional Shack-Hartmann wavefront sensor, phase function over the entire fiber-array aperture can then be retrieved using the coordinates obtained. The piston phases that are required for coherent combining (phase locking) of the outgoing beams at the target plane can be further calculated from the reconstructed wavefront phase. Results of analysis and numerical simulations are presented. Performance of adaptive precompensation of phase aberrations in this laser beam projection system type is compared for various system configurations characterized by the number of fiber collimators and atmospheric turbulence conditions. The wavefront control concept presented can be effectively applied for long-range laser beam projection scenarios for which the time delay related with the double-pass laser beam propagation to the target and back is compared or even exceeds the characteristic time of the atmospheric turbulence change - scenarios when conventional target-in-the-loop phase-locking techniques fail.

Proceedings Article | 25 September 2007 Paper

Anisoplanatic imaging through atmospheric turbulence: brightness function approach

Svetlana Lachinova, Mikhail Vorontsov, Vadim Dudorov, Valeriy Kolosov, Michael Valley

Proceedings Volume 6708, 67080E (2007) https://doi.org/10.1117/12.738796

KEYWORDS: Atmospheric turbulence, Turbulence, Atmospheric propagation, Atmospheric modeling, Imaging systems, Image quality, Numerical simulations, Lithium, Receivers, Atmospheric optics

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Proceedings Article | 23 August 2005 Paper

Performance analysis of an adaptive phase-locked tiled fiber array in atmospheric turbulence conditions

Svetlana Lachinova, Mikhail Vorontsov

Proceedings Volume 5895, 58950O (2005) https://doi.org/10.1117/12.617865

KEYWORDS: Adaptive optics, Mode locking, Control systems, Atmospheric turbulence, Solids, Optimization (mathematics), Wavefronts, Zernike polynomials, Atmospheric optics, Phase shifts

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Proceedings Article | 23 March 2000 Paper

Nonlinear ring resonator: spatial pattern generation

Vladimir Ivanov, Svetlana Lachinova, Nikita Irochnikov

Proceedings Volume 3928, (2000) https://doi.org/10.1117/12.379916

KEYWORDS: Resonators, Phase modulation, Light wave propagation, Diffraction, Mirrors, Mathematical modeling, Complex systems, Numerical simulations, Diffusion, Reflectivity

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Proceedings Article | 3 November 1999 Paper

Controlling of spatial patterns in nonlinear optical system with feedback

Nikita Irochnikov, Vladimir Ivanov, Svetlana Lachinova

Proceedings Volume 3760, (1999) https://doi.org/10.1117/12.367595

KEYWORDS: Modulation, Complex systems, Phase modulation, Control systems, Optical design, Numerical simulations, Nonlinear optics, Phase shift keying, Mirrors, Diffraction

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Proceedings Article | 28 January 1999 Paper

Flowerlike patterns and spatially localized structures in a nonlinear ring resonator

Vladimir Ivanov, Svetlana Lachinova, Nikita Irochnikov

Proceedings Volume 3733, (1999) https://doi.org/10.1117/12.340061

KEYWORDS: Resonators, Diffraction, Numerical simulations, Mirrors, Modulation, Light wave propagation, Complex systems, Phase modulation, Diffusion, Reflectivity

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Proceedings Article | 26 May 1998 Paper

Dynamics of nonlinear optical feedback system with noised input intensity

Victor Aleshkevich, Vladimir Ivanov, Nikita Irochnikov, Svetlana Lachinova

Proceedings Volume 3404, (1998) https://doi.org/10.1117/12.308653

KEYWORDS: Complex systems, Interferometers, Modulation, Nonlinear optics, Phase modulation, Numerical simulations, Stochastic processes, Diffraction, Feedback loops, Mathematical modeling

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