A nonlinear wave equation suitable for describing a propagation of a light pulse containing few oscillations of a strong electric fieki in isotropic dielectric media is deduced. It describes non-resonant dispersion of linear refractive index and non-inertial third-order non-linearity as well as inertia of dielectric non-linearity of electron nature, including parts caused by energy state populationdynamics and free electron motion.The dependence of the conditions for the dominance of different physical factors in the self-action of few-cycle optical ses-iii: dielectrics on the intensity, duration, and spectrum of radiation has been theoretically analyzed. It is shown that the larger the pulse width and the central wavelength, the stronger the effect of plasma nonlinearity. For example, for a quartz glass in the field of pulses with a duration of 10 fs and a central wavelength of 780 nm, this nonlinearity mechanism is dominant at intensities exceeding 3 -iO' W/cm2..
We consider the propagation of intense femtosecond pulses in a dielectric medium with an induced plasma. This plasma is excited by the strong electric field of the pulses, stimulating sequential electron transition to the conductivity band through excited discrete energy states. It is demonstrated that this simple dynamic model of ultrashort optical pulse propagation in a dielectric medium with self-induced plasma can be applied to experiments on the superbroadening of the pulse spectrum into the long-wavelength range, including terahertz generation, as well as the generation of high-order harmonics.
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