Abstract
In this paper we have investigated the nonlinear microwave third harmonic generation in a plasma-filled cylindrical waveguide. Fluid equations have been used to obtain the current density of the generated third harmonic. The nonlinearity arises through the modulation of collision frequency of electrons. For a microwave beam of power density ~21.7 MW/cm 2 and typical parameters: ω 0 = 1.5 × 10 11 rad/sec, ω p = 0.5 ω 0, v 0 = 0.1 ω 0, T 0 = 0.1 keV, and the radius of the cylindrical waveguide being of the order of the wavelength of the fundamental wave, the power conversion efficiency of the generated third harmonic turns out to be ~6.8 × 10 −3 for the TE 01 mode, and ~0.5 × 10 −3 for the TE 02 mode.
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