X and Y waves in the spatiotemporal Kerr dynamics of a self-guided light beam |
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Authors: | Miguel A Porras Alberto Parola |
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Institution: | a Departamento de Física Aplicada, Universidad Politécnica de Madrid, Rios Rosas 21, ES-28003 Madrid, Spain b CNISM and Department of Physics, University of Insubria, Via Valleggio 11, IT-22100 Como, Italy |
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Abstract: | The nonlinear stage of development of the spatiotemporal instability of the monochromatic Townes beam in a medium with self-focusing nonlinearity and normal dispersion is studied by analytical and numerical means. Small perturbations to the self-guided light beam are found to grow into two giant, splitting Y pulses featuring shock fronts on opposite sides. Each shocking pulse amplifies a co-propagating X wave, or dispersion- and diffraction-free linear wave mode of the medium, with super-broad spectrum. |
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