Multiple filamentation and control of properties of self-guided elliptical Gaussian laser beam
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The spatial evolution of an elliptical Gaussian beam in fluoride glass (Kerr medium) is studied using nonlinear Schrödinger equation solved by split-step beam propagation method. Solutions obtained by numerical simulation are analysed to study the effect of variation of input beam ellipticity on the process of multiple filamentation in elliptical Gaussian beam, where emphasis is on the properties of the self-guided Gaussian laser beam by externally induced input beam astigmatism. Controlling the properties of self-guided laser beam is a necessity in generation of tailored filaments.