A resonantly pumped three-level laser is analysed in a high-Q cavity under conditions of negligible and high pump depletion to obtain expressions for the emission characteristics in analytic form. Under high pump depletion our analysis predicts bistable emission in its steady state behaviour.
Interaction of two coherent fields with a homogeneously broadened three-level system is discussed for both a laser amplifier and laser oscillator under weak field emission. Analytic expressions are obtained to study explicitly the dependence of the amplifier emission characteristics on various pump parameters. These results are used to examine the steady-state and sustained oscillatory emission features of a single-mode laser oscillator. Subsequently, the amplifier analysis is generalized for an arbitrary deenergization to dephasing rate for the three-level system.>
The dynamic behaviour of a coherently pumped single-mode far-infrared ring laser with a homogeneously broadened three-level medium is analysed theoretically, considering detuning between amplifying transition and cavity frequencies. Phase diagrams as a function of cavity detuning and amplitude of the resonant pump field have been obtained, which show different domains of stationary, oscillatory and chaotic output. In some conditions the laser is shown to exhibit hysteresis between different regular self-pulsing regimes, i.e. the phenomenon of generalised bistability.