Pulse propagation in vacuum is analyzed for the general case 0≤ω_0τ_0<∞ (where τ_0 is the pulse duration and ω_0 is the carrier frequency) taking into account the diffraction effects that are due to the finite extension of the wave beam carrying the pulse. The analysis is based on the exact analytical solution of the nonstationary parabolic equation oЬtained in this paper {in time-coordinate representation). The case of а Gaussian wave packet with frequency and wave chirps has been discussed in detail.
Department of General Physics and Wave Processes
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