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PDF of thesis T15437 PDF of thesis T15437 - (32 M)
Title Orbital angular momentum and fully structured light in nonlinear media and cavities / Christopher John Gibson.
Name Gibson, C. J. .
Abstract The work in this thesis describes interesting phenomena that results from the interaction between high intensity laser light and nonlinear matter. By changing the structure of light's properties such as intensity and polarisation as well as the type of nonlinear action that occurs during propagation through the medium, we aim to describe how the properties of light are affected by the various interactions.
Abstract Considering down-conversion in a second order x(2) medium we first present a spatiotemporal mechanism for producing two dimensional optical rogue waves in a turbulent state driven by vortices with helical wavefronts. Self-organising hexagonal structures bound in phase lose stability and synchronised oscillations are unstable leading to phaseunbound vortex-mediated turbulence with high excursions in amplitude. Nonlinear amplification leads to rogue waves close to optical vortices, and probability density functions typical of rogue waves.
Abstract We then consider fully structured light (FSL) within a Kerr x(3) medium. In particular, we describe how the polarisation distribution of FSL beams is affected by propagation. In the linear case we derive an expression for the rotation of the polarisation and show the rotation is due to the difference in Gouy phase between the two eigenmodes in the beam. For nonlinear propagation we show the effect of the cross-phase modulation from self focusing results in additional rotation that can be controlled by changing various physical parameters of the FSL beam like the beam waist and magnitude of OAM.
Abstract Finally we consider the interaction with the Kerr medium in an optical cavity. Above Turing threshold we observe the formation of peaks upon the FSL structure. Where the beam carries a net orbital angular momentum we observe a rotation in the structure. We detail how the angular velocity of the Turing structure can be controlled by careful selection of the parameters of the FSL beams.
Publication date 2019.
Name Yao, Alison, degree supervisor.
Name Oppo, G.-L. degree supervisor.
Name University of Strathclyde. Department of Physics.
Thesis note Thesis Ph. D. University of Strathclyde 2019 T15437

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