Estatística da propagação e difusão de luz em vapores atômicos ressonantes

Detalhes bibliográficos
Ano de defesa: 2021
Autor(a) principal: PINTO, Sebastião da Silva lattes
Orientador(a): CHEVROLLIER, Martine Patrícia Arlette
Banca de defesa: ORIÁ, Marcos Cesar Santos, MORAES, Fernando Jorge Sampaio
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal Rural de Pernambuco
Programa de Pós-Graduação: Programa de Pós-Graduação em Engenharia Física
Departamento: Unidade Acadêmica do Cabo de Santo Agostinho
País: Brasil
Palavras-chave em Português:
Área do conhecimento CNPq:
Link de acesso: http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/8597
Resumo: Light propagationinamaterialmediumisdeterminedbyopticalpropertiesofthe material,whichmayinducespatialdeviationofdirection,aswellasdephasingand variationoftheamplitudeoftheincidentelectricfield.Lightmayalsomodifytheoptical propertiesofthemediumandthusexperience"self-induced"(medium-mediated)effects through nonlinearinteractionwiththemedium.Inallcases,thetransmittedorscattered field containsinformationabouttheinteractionprocess,whichcanbeusedtoanalyse either theprocessitselforthepropertiesoftheincidentfieldifthemediumisknown.As a statisticaldistributionoflightfieldsshouldbeverysensitivetodetailsandcomplexity of themedium,inourworkwestudiedhowthestatisticsofsuchadistributionis modified whenitpropagatesinanonlinearmedium.Inourexperiencesthemedium is anatomicvaporofCsandthefieldamonochromaticpatternwithrandomphases of thefieldofspecklesatfrequencytunablearoundthe D2 transitionofcesiumatoms. The statisticalpropertiesofthedistributionarecharacterizedthroughtheProbability Density Function(PDF)andthecorrelationfunction(g(2)) oftheintensitydistribution. WerealizednumericalsimulationsinPythonlanguage,whereweusedthedataof the D2lineofcesiumtosimulaterealconditionsofacesiumatomicvapor.Starting with anormaldistributionofincidentelectricfieldsinanonlinearmedium,ourresults evidencevariousinteractionregimesbetweenthelightandthematerial,dependingon the frequencyoftheincidentfield.Weparticularlyanalysetheevolutionofthewidth of thecorrelationfunction g(2) in thevariousregimes,aswellastheinfluenceofthe nonlinear absorptionofthemediumandoftheincidentlightpower.