Abstract
When an intense beam with a transverse intensity gradient propagates in a medium with positive Kerr nonlinearity n2, the induced refractive index profile actuates a lens, focusing the beam itself. For input powers above a critical threshold, P>Pcrit, self-focusing can subjugate beam divergence, resulting in catastrophic collapse and material failure [1]. For P<Pcrit diffraction deflects energy from the focal point, and in a fibre, divergence is reflected at the core/cladding boundary instigating a periodic transverse beam profile.
© 2011 Optical Society of America
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