Parametric decay of laser wave in inhomogeneous plasma region of double upper hybrid frequency [Параметрический распад лазерной волны в неоднородной плазме на удвоенной верхнегибридной частоте]

The parametric decay of a laser wave of extraordinary polarization in plasma in an external magnetic field is studied using numerical simulation. In this interaction, the pump wave decays into two upper hybrid plasmons, followed by cascade excitation of Bernstein modes. An extraordinary wave reflected from the plasma inhomogeneity region was detected at the upper hybrid frequency. It is concluded that such a wave is excited by upper hybrid plasmons that arose during primary decay. The dependence of the average electron energy gained during the development of the decay instability on the value of the external magnetic field and on the density gradient is investigated. © 2020 Federal Informational-Analytical Center of the Defense Industry. All rights reserved.