STEADY STATE IN A PARAMETRIC OSCILLATOR WITH A BACKWARD WAVE.

The absolute instability of materials with anomalous dispersion results in parametric oscillations with propagation of backward waves. The development of such an oscillation as a function of time has received relatively little attention. In this article authors use a relatively simple formula in order to derive an expression for the output amplitude of a backward wave, generated as a function of time in a sufficiently long sample of lossless material.