Dinâmica e ruído quântico em osciladores paramétricos óticos com momento angular orbital

• Ano de defesa: 2009
• Autor(a) principal: Santos, Bernardo Coutinho Camilo dos
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Programa de Pós-graduação em Física; Física
• Palavras-chave em Português: Óptica quântica; Ruído quântico; Fase geométrica; Oscilador paramétrico óptico; Modo de Laguerre-Gauss; CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA
• Link de acesso: https://app.uff.br/riuff/handle/1/18860

We shall present a description of beams bearing orbital angular momentum (OAM)in the paraxial regime, in addition to techniques showing how to produce such beams. Followed by a brief classical description of the optical parametric amplification process in the context of optical parametric oscillators (OPO). We present a summary of the assembly of the LOQ - Quantum Optics Laboratory of UFF and the assembly of the first OPO of the Rio de Janeiro state. We then investigate the transfer of OAM in a type II OPO where, pumping it with a Laguerre-Gaussian mode, was possible to produce many kinds of transverse modes. Still in the classical context, we suggest an experiment to measure the geometrical phase conjugation in an OPO injected with OAM, which occurs when the injection beam is subjected to a set of cyclic transformations that describes a closed path in the Poincaré sphere. We also suggest, with the aid of the Poincaré representation, an analogy between a kind of mode diffusion and the known phase diffusion that occurs in an OPO. Finally, we analyze the quantum dynamics of a non degenerate injected OPO from the equations of motion in the positive-P representation. We shall make the linear stability analysis of the steady state and the quantum noise dynamics by a perturbation approach that allows us to find analytical solutions, both in the classical and the quantum regime. With this approach, we shall show that this operation regime allows us to produce relatively intense beams with quantum EPR correlations.