A
Alexandr Shumelyuk
Researcher at National Academy of Sciences of Ukraine
Publications - 56
Citations - 449
Alexandr Shumelyuk is an academic researcher from National Academy of Sciences of Ukraine. The author has contributed to research in topics: Photorefractive effect & Grating. The author has an hindex of 11, co-authored 55 publications receiving 437 citations. Previous affiliations of Alexandr Shumelyuk include National Academy of Sciences.
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Light pulse slowing down up to 0.025 cm/s by photorefractive two-wave coupling.
TL;DR: It is shown experimentally and theoretically that photorefractive wave coupling can be used for dramatic (< or approximately 0.025 cm/s) deceleration of light pulses whose width is larger than (or comparable with) the nonlinear response time.
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Slowing down of light in photorefractive crystals with beam intensity coupling reduced to zero.
Alexandr Shumelyuk,Konstantin Shcherbin,Serguey Odoulov,B. Sturman,Evgeniy V. Podivilov,Karsten Buse +5 more
TL;DR: A considerable deceleration of light pulses in crystals with nearly compensated space-charge field proves that the strong dispersion of dynamic photorefractive gratings in the vicinity of Bragg resonance is of primary importance for light slowing down.
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Studies of light-induced charge transfer in Sn2P2S6 by combined EPR/optical absorption spectroscopy
TL;DR: In this paper, the light-induced charge transfer in ferroelectric tin hypothiodiphosphate Sn 2 P 2 S 6 was investigated by means of optical absorption and EPR spectroscopy and their combination.
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Interference and holography with femtosecond laser pulses of different colours
Serguey Odoulov,Alexandr Shumelyuk,Holger Badorreck,Stefan Nolte,Kay-Michael Voit,Mirco Imlau +5 more
TL;DR: It is shown here that fringes can be observed and holograms can be recorded with ultrashort, sub-picosecond pulses even of different colour, generated in the experiment with two parametric amplifiers seeded, both by the same mode-locked Ti-sapphire laser.
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Multiline coherent oscillation in photorefractive crystals with two species of movable carriers
TL;DR: In this paper, the frequency separation of two oscillation modes (and modulation frequency of the output intensity) depend on the incident light intensity and spatial frequency of a developing grating.