A theory of self‐focusing of intense electromagnetic waves in ducts with parabolic and saturating nonlinearity has been developed. The relative effects of inhomogeneity in the refractive index of the medium, parabolic nonlinearity due to small electrical polarization of the medium, and saturating nonlinearity due to considerable electrical polarization on self‐focusing have been studied.
An analysis of the modulation of an electromagnetic wave propagating through a magnetoplasma disturbed by an acoustic wave has been given. The analysis of the modulation of the transmitted and reflected waves from the boundary between the magnetoplasma and free space has also been given. Numerical calculations have been made to study the variation of modulation with electron density, collision frequency, magnetic field, acoustic power and distance from the acoustic wave source.
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