Short pulse generation in a cavity with an active layer and a dielectric mirror

In this paper, generation of anharmonic and chaotic signals in a cavity with an active layer has been numerically investigated. The active layer can be formed by a laser medium, by a semiconductor of N-type current-voltage characteristics, by an array of Josephson junctions or semiconductor devices like tunnel or Gunn diodes, or field-effect transistors in active state. When the coupling of the electromagnetic field and the active layer is sufficiently strong, self-excitation of high-frequency anharmonic oscillations with transition to dynamical chaos can be observed in the systems of this kind. Particularly, we studied the dynamics of such oscillations in a cavity with a GaAs active layer and with a dielectric mirror intended for transmitting electromagnetic signals into the outer free space. The dielectric mirror is also operating as a resonant filter when reflecting the electromagnetic field back into the cavity or transmitting it into free space