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VOLUME 56 (1992) | ISSUE 9 | PAGE 455
Self-focusing and defocusing of electromagnetic-wave beams in the case of a thermal nonlinearity
The self-effects of Laguerre electromagnetic beams of zeroth and first orders propagating in a weakly absorbing medium are analyzed. In a first-order perturbation theory in the nonlinearity, the axial intensity of the radiation is calculated for steady-state and unsteady-state propagation, for various focusing conditions. A generalization of the results to the case of a pronounced nonlinearity is proposed.