Mr. Alexander Shurygin Profile

Alexander Shurygin

at James River Branch LLC

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Publications (3)

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Proceedings Article | 14 September 2018 Presentation + Paper

Beam shaping in "light pen" holographic originating system

A. Smyk, A. Shurygin

Proceedings Volume 10744, 107440D (2018) https://doi.org/10.1117/12.2319019

KEYWORDS: Holograms, Holography, Beam shaping, Photoresist materials, Diffraction, Optical components, Diffraction gratings

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Most automated holographic origination systems work in “stop-and-repeat” mode thus making framed fringe structure. It means that the final holographic image consists of “bricks”. So, origination systems giving non-fragmented, continuous fringe structure is useful for expert verification. “Light pen” origination systems (LP) make continuous rainbow lines scanning a photoresist plate with a focused laser spot. Intensity distribution across the spot effects greatly on diffraction efficiency and image quality. Beam shaping, not exactly gauss-to-flat, has a critical value for such systems.

Positive photoresists are in wide use for rainbow hologram origination. The media have high contrast and very narrow linear part of an exposure curve. The Gaussian intensity profile of a scanning spot gives over-exposure in the center of rainbow line and under-exposure next to its periphery. A rainbow lines lose brightness and edge sharpness. The device developed was equipped with 6_6_VIS pi-shaper for 405 nm. The device optical scheme and a number of practical aspects are considered. A circular spot even with flattop gives non-uniform exposure across a rainbow line. Two solutions were studied: M-shape spot and a flattop square spot. Both can be done with Pi-shapers.

M-spot gives better results for smooth lines, while square aperture is better for sharp tracks.

Pi-shaper required special attention for the alignment of the system components especially to tilts and shifts. The system developed allows high-speed hologram origination, adequate security features for expert authentication and prevents the possibility of being counterfeited by most recording systems.

Proceedings Article | 14 September 2018 Presentation + Paper

Direct hologram recording on metal surface

A. Smyk, A. Shurygin

Proceedings Volume 10744, 107440C (2018) https://doi.org/10.1117/12.2318793

KEYWORDS: Beam shaping, Metals, Holograms, Holography, Diffraction gratings, Laser engraving, Diffraction, Pulsed fiber lasers, Gaussian beams

Read Abstract +

Engraving a holographic image directly on metal surface has a great potential application. Common laser engraving devices can produce only limited grayscale image. Some of devices can create colors by effect of discoloration.

To make effective and controllable diffractive gratings the optical system was developed combining high power laser source and interferometric dot-matrix approach. The paper presents considerations and some experimental data.

The direct interference gratings were formed on flat metal surfaces like Ni, Cr, brass and stainless steel like AISI 305. Stable structures with adequate diffraction efficiency were obtained. The experimental setup used 1064 nm high-frequency pulsed fiber laser. The samples shows a threshold character of the interaction that requires beam-shaping devices to convert Gaussian distribution to flattop with minimum power losses. The resulting diffraction gratings had 275 lines per mm and nearly sine profile. Pi-shaper 6_6_1064 allowed most effective filling of metal surface thus giving good grating spatial uniformity and diffraction efficiency.

Direct holographic gratings on flat metal surfaces were obtained and prototype dot matrix machine suggested. Spatial frequency needs to be increased to get better color separation and the range of materials expanded. We expect the new approach to improve quality and security features of holographic security marking.

Proceedings Article | 30 November 2017 Paper

Acousto-optical imaging spectrometer for unmanned aerial vehicles

M. Gaponov, A. Machikhin , V. Pozhar, A. Shurygin

Proceedings Volume 10466, 104661V (2017) https://doi.org/10.1117/12.2288303

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The airborne hyperspectral (HS) systems for geomonitoring from board of unmanned aerial vehicles (UAV) use special modes of collection, transmission and processing of HS information. We suggest that autonomous mode can be realized on the base of real-time on-board information processing by means of spectral imaging. We demonstrate that such systems based on aberration-compensated pair of acousto-optical tunable filters (AOTF) satisfy most of the requirements for UAV HS system. The operation principle, characteristic features and prospects of the developed HS imaging system are described.

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