Abstract
An optical-vortex soliton was observed in a bulb self-defocusing nonlinear refractive medium (n2<0).1 In general, an optical vortex is characterized by a transverse field having a 2π helical phase ramp and zero on-axis intensity, A(0) =02. An interferogram of this field profile shows two equiphase lines merging into one (see Fig. 1). The counteracting forces of diffraction and nonlinear refraction in a self-defocusing medium allow the dart vortex core to propagate as a stable stationary filament. We confirmed that the area of the core is inversely proportional to the background intensity of the beam. Owing to the higher refractive index (n = n0 + n2I).
© 1993 Optical Society of America
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