Double-boson stimulated terahertz emission in a polariton cascade laser

A system of equidistant polariton states interacting with a terahertz electromagnetic field are considered that are localized in a cavity for terahertz radiation. Accumulation of terahertz photons in the cavity, together with boson stimulation of the transitions between polariton levels, leads to intense radiative transitions between terahertz levels. A concept of double-boson stimulated transitions between polariton levels in the boson cascade laser is proposed. We study a possibility of using the boson cascade laser in generation of terahertz radiation. The system exhibits threshold dependence of the intensity of terahertz radiation on pumping. The quantum effectiveness of the boson cascade laser can exceed unity when pumping is performed above the threshold. The interaction of polaritons with the cavity leads to an increase in the threshold of pumping and a decrease in quantum effectiveness.