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One of the most fascinating manifestations of optical nonlinearities, associated with an intensity-dependant refractive index modulation, is the spontaneous self-focusing of an optical beam. It occurs due to lensing effects induced within the nonlinear optical medium. For the case when the strength of the focusing effect exactly balances the diffraction that occurs during proagation of the optical beam, a bright spatial soliton forms which is equivalent to a self-trapped light beam that does not change its shape during propagation.
© 2001 EPS
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