0000000000358674

AUTHOR

Alexander A. Grabar

showing 4 related works from this author

Manipulation of fast light using photorefractive beam fanning

2014

Light pulse group velocity manipulations due to the specific dispersion of a medium (so-called “slow” and “fast” light phenomena) can be obtained on the basis of several mechanisms. One of these techniques is two-wave mixing in a photorefractive crystal. This work presents a modification of this method, exploiting the strong beam fanning in Sb-doped Sn2P2S6 crystals. Our experimental results demonstrate a “fast light” behavior of Gaussian pulses transmitted through a Sn2P2S6:Sb sample. The phenomenon is due to the beam fanning (i.e., the self-diffraction of the incident beam on self-induced noisy photorefractive gratings) that ensures a significant depletion of the input beam. Due to the re…

Materials sciencebusiness.industryPhase (waves)Statistical and Nonlinear PhysicsPhotorefractive effectAtomic and Molecular Physics and OpticsOpticsDispersion (optics)Light beamGroup velocityM squaredLaser beam qualitybusinessBeam (structure)Journal of the Optical Society of America B
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Enhanced photorefractive properties of Bi-doped Sn2P2S6

2008

International audience; Enhanced photorefractive properties of tin hypothiodiphosphate (Sn2P2S6) crystals as a result of Bi doping are presented. These new crystals were obtained by the vapor-transport technique using stoichiometric Sn2P2S6 composition with an additional amount of Bi up to 0.5 mol. % in the initial compound. The bandgap edges of the obtained crystals are located at ~750 nm and shift toward the red wavelengths with increasing Bi concentration. Sn2P2S6:Bi crystals are found to exhibit larger two-beam coupling gain coefficients (up to 17 cm−1 at a wavelength of 854 nm) as compared to (i) pure Sn2P2S6 (2.5 cm−1 at 854 nm), (ii) Sn2P2S6 crystals modified by the growth conditions…

Materials sciencePhotorefractive materialsNonlinear opticsBand gapAnalytical chemistrychemistry.chemical_element02 engineering and technologyDielectricNon linear material01 natural sciencesTernary compoundsDoped materials010309 opticsOptics0103 physical sciencesTin HypothiophosphatesOptical propertiesbusiness.industryDopingTwo wave mixingStatistical and Nonlinear PhysicsPhotorefractive effect021001 nanoscience & nanotechnologyPhotorefractive effectAtomic and Molecular Physics and OpticsBismuth additionsLight intensityWavelengthchemistryEnergy transferDielectric propertiesOptical materials0210 nano-technologybusinessTinRefractive index
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Photorefractive “camera obscura”

2011

Abstract We demonstrate a novel scheme for lensless image formation which combines the properties of an amplifying dynamic hologram and a pinhole camera. The scheme is realized on the base of a SPS:Sb1% photorefractive crystal working at 633 nm.

PhysicsImage formationbusiness.industryHolographyPhotorefractive effectPhysical opticsAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic Materialslaw.inventionOpticslawPhotorefractive crystalPinhole cameraOptoelectronicsElectrical and Electronic EngineeringPhysical and Theoretical ChemistrybusinessCamera obscuraOptics Communications
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Photorefractive and photochromic effects in Sn2P2S6 at various temperatures

2013

Abstract Photochromic effect in nominally pure and doped Sn 2 P 2 S 6 photorefractive crystals is investigated in the temperature range 120–310 K. This effect determines a mechanism of the amplitude hologram formation at low temperatures, and we show that a competition between the photorefractive (phase) and the amplitude gratings occurs at increasing temperature.

Materials sciencebusiness.industryDopingHolographyPhotorefractive effectAtmospheric temperature rangeAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsOrganic photorefractive materialslaw.inventionPhotochromismAmplitudeOpticslawPhase (matter)Electrical and Electronic EngineeringPhysical and Theoretical ChemistrybusinessOptics Communications
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