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Vectorial beam coupling in fast photorefractive crystals with AC-enhanced response

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https://osnadocs.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2004092812
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dc.contributor.advisorProf. Dr. Klaus Ringhofer
dc.contributor.advisorProf. Dr. Eckhard Krätzig
dc.creatorFilippov, Oleg
dc.date.accessioned2010-01-30T14:35:58Z
dc.date.available2010-01-30T14:35:58Z
dc.date.issued2004-09-28T11:02:02Z
dc.date.submitted2004-09-28T11:02:02Z
dc.identifier.urihttps://osnadocs.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2004092812-
dc.description.abstractWe develop a theory of vectorial wave coupling in cubic photorefractive crystals placed in an alternating ac-field to enhance the nonlinear response. First we analytically and numerically investigate the dependences of the first Fourier harmonics of the space-charge field, induced in an AC-biased sillenite crystal by a light-interference pattern, on the light contrast m. The data obtained was used to extend the vectorial beam-coupling theory on the whole contrast region. In particular, we proved in the general case that despite of essential differences between thediffusion and AC nonlocal responses the later keeps the light interference fringes straight during the interaction. This fundamental feature allows, under certain restrictions, to reduce the nonlinear problem of vectorial coupling to the known linear problem of vectorial Bragg diffraction from a spatially uniform grating, which admits an exact solution. As a result, the nonlinear vectorial problem can be effectively solved for a number of practically important cases.The developed theory was applied to describe the transformation of a momentary phase changes of one of the input beams into the output intensity modulation (so-called grating translation technique). In contrast to the previous studies, we take into account the change of the space-charge field amplitude across the crystal (the coupling effects). The theory developed is employed to optimize the conditions for the linear signal detection under polarization filtering for the transverse and longitudinal optical configurations. We also analyze the possibility of the linear detection without polarization filtering.Illumination of AC-biased photorefractive BTO crystals with a coherent light beam results in development of strong nonlinear scattering. We investigate the angular and polarization characteristics of the scattered light for the diagonal optical configuration and different polarization states of the pump.eng
dc.language.isoeng
dc.subjectphotorefractive
dc.subjectnonlinear
dc.subjectvectorial
dc.subjectcoupling
dc.subjectdetection
dc.subjectgrating
dc.subjectfiltering
dc.subjectlight scattering
dc.subjectdiffraction
dc.subjectsillenite
dc.subject.ddc530 - Physikger
dc.titleVectorial beam coupling in fast photorefractive crystals with AC-enhanced responseeng
dc.title.alternativeVectorial beam coupling in fast photorefractive crystals with AC-enhanced responseeng
dc.typeDissertation oder Habilitation [doctoralThesis]-
thesis.locationOsnabrück-
thesis.institutionUniversität-
thesis.typeDissertation [thesis.doctoral]-
thesis.date2004-09-20T12:00:00Z-
elib.elibid345-
elib.marc.edtfangmeier-
elib.dct.accessRightsa-
elib.dct.created2004-09-23T09:54:42Z-
elib.dct.modified2004-09-28T11:02:02Z-
dc.contributor.refereeDr. Ekaterina Shamonina
dc.subject.dnb29 - Physik, Astronomieger
dc.subject.pacs42.70.Nq - Other nonlinear optical materials; photorefractive and semiconductor materialseng
dc.subject.pacs42.65.Hw - Phase conjugation; photorefractive and Kerr effectseng
dc.subject.pacs42.65.Ky - Frequency conversion; harmonic generation, including higher-order harmonic generationeng
dc.subject.pacs78.20.Bh - Theory, models, and numerical simulationeng
dc.subject.pacs42.40.Eq - Holographic optical elements; holographic gratingseng
dc.subject.pacs42.30.Lr - Modulation and optical transfer functionseng
dc.subject.pacs42.40.Ht - Hologram recording and readout methodseng
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