Detalhes bibliográficos
| Ano de defesa: |
2021 |
| Autor(a) principal: |
PINTO, Sebastião da Silva
 |
| 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: |
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| 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. |
