The Effect of Ponderomotive Force of a Laser Pulse on the Frequency Shift of its X-mode Propagation

The ponderomotive force of a laser pulse launched into relatively rarefied plasma excites an ion acoustic wave and an electromagnetic wave inside the plasma. The ion acoustic wave induces some perturbation in the plasma density. The wave equation is written for the ion acoustic wave and the relative density perturbation δn/n is calculated as function of this wave's frequency ωA. The produced electromagnetic wave propagates through the plasma in the presence of a magnetic field both in O(ordinary) and X(extraordinary) modes. In this work estimation is made for the frequency shift of the X‐mode propagation due to the density perturbation in relatively rarefied magnetized plasma.