プラズマ中の有限振幅電磁波の第二調波プラズマ共振

概要

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When two electromagnetic waves of different frequencies, f_1 and f_2,are incident upon a semi-infinite plasma of the plasma frequency f_p, the second order fluctuations of charge density of frequencies, 2f_1,2f_2,f_1+f_2 and |f_1-f_2| are excited in the plasma. The difference frequency wave is of particular interest, since plasma resonance occurs in the plasma. We previously reported that the plasma resonance at the difference frequency takes place, if |f_1-f_2|=f_p, where the plasma is lossless. At the beginning of this report we theoretically study the resonance in a dissipative, nonmagnetized, cold plasma. In this connection, we neglect thermal effects throughout, since we limited ourselves to the study of true dynamic nonlinearities. As the result, we conclude that the resonance frequency is affected by the collision frequency ν of the plasma, and that the resonance frequency increases with the increase of the collision frequency. We also come to conclusion that the amplitude of the difference wave becomes finite but small, when ν is large. We experimentally observe the plasma resonance of the difference wave in the plasma waveguide, too. The experimental results are in good agreement with the theoretically predicted values.
山梨大学の論文