Strong and fast phase modulation for quantitative analysis of photorefractive gratings

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dc.contributor.authorFreschi, A. A.
dc.contributor.authorDos Santos, P. V.
dc.contributor.authorFrejlich, J.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.date.accessioned2014-05-20T15:23:10Z
dc.date.available2014-05-20T15:23:10Z
dc.date.issued2006-05-01
dc.description.abstractA new approach for studying photorefractive gratings in two-wave mixing experiments by a phase modulation technique is presented. The introduction of a large-amplitude, high-frequency sinusoidal phase modulation in one of the input beams blurs the interference pattern and provides powerful harmonic signals for accurate measurements of the grating diffraction efficiency eta and the output phase shift rho between the transmitted and diffracted waves. The blurring of the light fringes can be used to suppress the higher spatial harmonics of the grating, allowing a space-charge field with sinusoidal profile to be recorded. Although the presence of such a strong phase modulation affects the beam coupling in a rather complicated way, it is shown that for the special case of equal intensity input beams, the effect of the phase modulation on eta and rho is reduced to a weakening of the coupling strength. The potentialities of the technique are illustrated in a study of refractive-index waves excited by running interference patterns in a Bi12TiO20 crystal. Expressions for the diffraction efficiency and the output phase shift are derived and used to match numerically calculated curves to the experimental data. The theoretical model is supported by the very good data fitting and allows the computation of important material parameters.en
dc.description.affiliationUniv Estadual Paulista, Dept Fis, IGCE, BR-13500970 Rio Claro, SP, Brazil
dc.description.affiliationUniv Estadual Campinas, Lab Opt, IFGW, BR-13083970 Campinas, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Fis, IGCE, BR-13500970 Rio Claro, SP, Brazil
dc.format.extent279-284
dc.identifierhttp://dx.doi.org/10.1007/s00340-006-2145-x
dc.identifier.citationApplied Physics B-lasers and Optics. New York: Springer, v. 83, n. 2, p. 279-284, 2006.
dc.identifier.doi10.1007/s00340-006-2145-x
dc.identifier.issn0946-2171
dc.identifier.urihttp://hdl.handle.net/11449/34013
dc.identifier.wosWOS:000236750700021
dc.language.isoeng
dc.publisherSpringer
dc.relation.ispartofApplied Physics B: Lasers and Optics
dc.relation.ispartofjcr1.881
dc.relation.ispartofsjr0,740
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleStrong and fast phase modulation for quantitative analysis of photorefractive gratingsen
dc.typeArtigo
dcterms.licensehttp://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dcterms.rightsHolderSpringer
unesp.author.orcid0000-0003-1494-0063[1]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt

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Artigos - Física - IGCE