Non Linear Optics
Mostrando 13-20 de 20 artigos, teses e dissertações.
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13. GLASS ELECTROTHERMAL POLING AND CHARACTERIZATION TECHNIQUES / POLARIZAÇÃO ELETROTÉRMICA DE VIDROS E TÉCNICAS DE CARACTERIZAÇÃO
It is possible to create a second order non linearity in silica samples with the poling process. The glass samples with an induced X(2) have a potential application on the fabrication of optical devices such as modulators and frequency converters. In the electrothermal poling process, high voltage and high temperature are applied to the samples forming an io
Publicado em: 2004
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14. SÃntese e caracterizaÃÃo de novos derivados mesoiÃnicos para aplicaÃÃo de Ãptica nÃo-linear e atividade biolÃgica
Mesoionic compounds constitute a group of heterocyclic betaines stabilized by delocalisation of electrons and charge, the synthesis of which has proven of great interest. This stemmed from (a) their wide range of biological activity with a considerable possibility of obtaining pharmaceuticals; (b) their special physical properties for non-linear optics appli
Publicado em: 2004
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15. Estudo das propriedades de armazenamento óptico e grades de relevo em poliuretano derivado de azo-benzeno / Information optically storage and relief gratings study in material derivative of azo-benzene polyrethane
Polymers containing azobenzenic groups have been studied due to their applications on non-linear optics, surface relief gratings (SRG) and photoinduced anisotropy for optical storage. The reversal photoisomerization trans-cis-trans property of the azo group induces a molecular reorientation. In this work, cast films of na azobenzene derivative, the polyureth
Publicado em: 2003
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16. Quantum noise compression and transverse effects in optical parametric oscillators. / Compressão de ruído quântico e efeitos transversos em osciladores paramétricos óticos.
Apresentamos neste trabalho o projeto e a construção de um Oscilador Paramétrico Ótico (OPO), demonstrando o caráter quântico da correlação de intensidade dos feixes sinal e complementar nele produzidos a partir de um feixe de bombeio de 532 nm. Estudamos ainda a compressão quântica de ruído no feixe de bombeio refletido por uma cavidade de OPO, o
Publicado em: 2002
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17. Estudo de propriedades ópticas não-lineares de cristal líquido dopado com corante em função da temperatura. / Studies of non-linear optical properties of dye doped liquid crystal in function of the temperature.
With the objective of studying the effects due to the addition of a dye in a thermotropic liquid crystal (LC), we investigated in this work the influence of the temperature in the reorientation of the molecules of this compound, as well as the refraction index and the non linear absorption, in the presence of a electromagnetic field. The studied LC presents
Publicado em: 2000
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18. Aplicação da técnica de varredura-Z para a determinação de parâmetros térmicos. / Z-scan technique to evaluate thermal parameters.
The Z-Scan technique is the most popular one for the determination of the nonlinear index of refraction (n2) of transparent media. In this work we present a theoretical analysis and results of the reflection z-scan technique, aiming the research of thermal effects in highly absorbing materials. Extensions of the technique, such as the time resolved z-scan an
Publicado em: 1998
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19. Phase conjugation and transverse self-phase modulation in Cr+3 doped crystals / Conjugação de fase e modulação transversal de fase em cristais dopados com Cr+3
In this work we studied theoretical and experimentally the effects of Phase Conjugation by Degenerate Four Wave Mixing and Transversal Phase (PCD4WM) Modulation in Cr+3 doped crystals. We studied the PDC4WM in Al2O3:Cr+3 (ruby) and GdAlO3:Cr+3 with on Ar laser (at λ= 514 nm) and obtained a good agreement between our experimental and theoretical results
Publicado em: 1989
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20. Study of kinetic and formation of aggregates in ionic crystals using two photon absorption technique. / Estudo da cinética e formação de agregados em cristais iônicos pela técnica de absorção de dois fótons.
In this work we realize the study of the Kinetic and formation of precipitates in ionic crystals doped with divalent impurities by the TPA (two photon absorption) spectroscopy technique. We analyze the formation of the aggregates in crystals annealed at temperatures of 50 and 250°C. We measured the TPA of the transition 4f7 → 4f7 of the Eu2+, which
Publicado em: 1985