PHASE SELF-MODULATION OF SINGLE-CYCLE OPTICAL WAVES
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Analytical and numerical solutions of the equation describing the dynamics of the light pulse field in isotropic
dielectric medium with normal group dispersion and cubic delayless nonlinearity are obtained for the boundary condition of single-cycle optical wave. It is shown that spectral broadening of such extremely short pulses by the number of oscillations occurs both in a high- and low-frequency region in nonlinear medium. Spectral density maximum of radiation shifts to low-frequency region. Formation of triple frequency radiation which is customary in the medium with cubic nonlinearity doesn’t occur but the wave is generated with the central frequency approximately 4.5 times more than initial wave frequency.