Branching, coexistence and collapse of inversion states in solid-state microwave quantum devices

Investigation of dynamical processes in microwave laser-like quantum devices is of great interest because of extremely low level of intrinsic noises (spontaneous emission) in their active media. One of the most interesting features of laser dynamics is branching of nonequilibrium states in dissipative system, which includes active medium and resonators, tuned to the frequencies of pumping and signal fields. The pointed branching leads to coexistence of various, sometimes very complex forms of regular, chaotic and transient inversion states. Understanding of the nature of inversion formation and evolution is of vital importance to the quantum electronics. In this report, we present results of investigations of microwave power spectra (MPS) and spatiotemporal dynamics (STD) concerning on the relationship between complex fine structure of MPS and corresponding evolution of patterns in STD.